{
  "alt_adi_least": {
    "ci": [
      7.2,
      7.7
    ],
    "ciLevel": 0.95,
    "display": "7.4%",
    "estimand": "births-weighted mean of county shares (the pooled share); 95% intervals from a bootstrap over counties",
    "n": 57,
    "nUnit": "counties",
    "note": "",
    "period": "births in 2018 to 2024",
    "population": "the least deprived tenth of counties ranked by Area Deprivation Index, among the counties with all four rankings",
    "source": "wonder-natality",
    "unit": "Births under 2,500 grams (% of live births)",
    "value": 7.42735,
    "weights": "births in each county"
  },
  "alt_adi_most": {
    "ci": [
      9.1,
      10.2
    ],
    "ciLevel": 0.95,
    "display": "9.6%",
    "estimand": "births-weighted mean of county shares (the pooled share); 95% intervals from a bootstrap over counties",
    "n": 58,
    "nUnit": "counties",
    "note": "",
    "period": "births in 2018 to 2024",
    "population": "the most deprived tenth of counties ranked by Area Deprivation Index, among the counties with all four rankings",
    "source": "wonder-natality",
    "unit": "Births under 2,500 grams (% of live births)",
    "value": 9.62571,
    "weights": "births in each county"
  },
  "alt_adi_rho": {
    "display": "+0.99",
    "estimand": "Spearman rank correlation between bin order and bin mean, each bin counted once",
    "note": "",
    "period": "births in 2018 to 2024",
    "population": "the bins of counties ranked by Area Deprivation Index",
    "source": "wonder-natality",
    "unit": "rank correlation",
    "value": 0.987879,
    "weights": "each bin counted once"
  },
  "alt_degree_least": {
    "ci": [
      7.2,
      7.9
    ],
    "ciLevel": 0.95,
    "display": "7.6%",
    "estimand": "births-weighted mean of county shares (the pooled share); 95% intervals from a bootstrap over counties",
    "n": 57,
    "nUnit": "counties",
    "note": "",
    "period": "births in 2018 to 2024",
    "population": "the least deprived tenth of counties ranked by Bachelor's degree share, among the counties with all four rankings",
    "source": "wonder-natality",
    "unit": "Births under 2,500 grams (% of live births)",
    "value": 7.55219,
    "weights": "births in each county"
  },
  "alt_degree_most": {
    "ci": [
      7.8,
      8.6
    ],
    "ciLevel": 0.95,
    "display": "8.2%",
    "estimand": "births-weighted mean of county shares (the pooled share); 95% intervals from a bootstrap over counties",
    "n": 58,
    "nUnit": "counties",
    "note": "",
    "period": "births in 2018 to 2024",
    "population": "the most deprived tenth of counties ranked by Bachelor's degree share, among the counties with all four rankings",
    "source": "wonder-natality",
    "unit": "Births under 2,500 grams (% of live births)",
    "value": 8.15626,
    "weights": "births in each county"
  },
  "alt_degree_rho": {
    "display": "+0.68",
    "estimand": "Spearman rank correlation between bin order and bin mean, each bin counted once",
    "note": "",
    "period": "births in 2018 to 2024",
    "population": "the bins of counties ranked by Bachelor's degree share",
    "source": "wonder-natality",
    "unit": "rank correlation",
    "value": 0.684848,
    "weights": "each bin counted once"
  },
  "alt_income_least": {
    "ci": [
      7,
      7.3
    ],
    "ciLevel": 0.95,
    "display": "7.2%",
    "estimand": "births-weighted mean of county shares (the pooled share); 95% intervals from a bootstrap over counties",
    "n": 57,
    "nUnit": "counties",
    "note": "",
    "period": "births in 2018 to 2024",
    "population": "the least deprived tenth of counties ranked by Median household income, among the counties with all four rankings",
    "source": "wonder-natality",
    "unit": "Births under 2,500 grams (% of live births)",
    "value": 7.16218,
    "weights": "births in each county"
  },
  "alt_income_most": {
    "ci": [
      9.4,
      10.6
    ],
    "ciLevel": 0.95,
    "display": "10.0%",
    "estimand": "births-weighted mean of county shares (the pooled share); 95% intervals from a bootstrap over counties",
    "n": 58,
    "nUnit": "counties",
    "note": "",
    "period": "births in 2018 to 2024",
    "population": "the most deprived tenth of counties ranked by Median household income, among the counties with all four rankings",
    "source": "wonder-natality",
    "unit": "Births under 2,500 grams (% of live births)",
    "value": 9.99451,
    "weights": "births in each county"
  },
  "alt_income_rho": {
    "display": "+0.96",
    "estimand": "Spearman rank correlation between bin order and bin mean, each bin counted once",
    "note": "",
    "period": "births in 2018 to 2024",
    "population": "the bins of counties ranked by Median household income",
    "source": "wonder-natality",
    "unit": "rank correlation",
    "value": 0.963636,
    "weights": "each bin counted once"
  },
  "alt_n_places": {
    "display": "578",
    "estimand": "count of counties in the common sample of the ranking comparison",
    "note": "",
    "period": "births in 2018 to 2024",
    "population": "counties with the outcome and all four rankings",
    "source": "wonder-natality",
    "unit": "counties",
    "value": 578,
    "weights": "none (full count)"
  },
  "alt_rho_cut": {
    "display": "0.9",
    "estimand": "threshold between a steady and an uneven gradient",
    "note": "",
    "period": "births in 2018 to 2024",
    "population": "the rule for changed gradients (docs/RANKING_SWITCH_RULE.md)",
    "source": "wonder-natality",
    "unit": "absolute rank correlation",
    "value": 0.9,
    "weights": "none (a fixed rule)"
  },
  "alt_rho_margin": {
    "display": "0.1",
    "estimand": "smallest move in the rank correlation that counts as a change of shape",
    "note": "",
    "period": "births in 2018 to 2024",
    "population": "the rule for changed gradients (docs/RANKING_SWITCH_RULE.md)",
    "source": "wonder-natality",
    "unit": "absolute rank correlation",
    "value": 0.1,
    "weights": "none (a fixed rule)"
  },
  "alt_std_least": {
    "ci": [
      7,
      7.3
    ],
    "ciLevel": 0.95,
    "display": "7.2%",
    "estimand": "births-weighted mean of county shares (the pooled share); 95% intervals from a bootstrap over counties",
    "n": 57,
    "nUnit": "counties",
    "note": "",
    "period": "births in 2018 to 2024",
    "population": "the least deprived tenth of counties ranked by Standardized index, among the counties with all four rankings",
    "source": "wonder-natality",
    "unit": "Births under 2,500 grams (% of live births)",
    "value": 7.15566,
    "weights": "births in each county"
  },
  "alt_std_most": {
    "ci": [
      9,
      10.4
    ],
    "ciLevel": 0.95,
    "display": "9.7%",
    "estimand": "births-weighted mean of county shares (the pooled share); 95% intervals from a bootstrap over counties",
    "n": 58,
    "nUnit": "counties",
    "note": "",
    "period": "births in 2018 to 2024",
    "population": "the most deprived tenth of counties ranked by Standardized index, among the counties with all four rankings",
    "source": "wonder-natality",
    "unit": "Births under 2,500 grams (% of live births)",
    "value": 9.73416,
    "weights": "births in each county"
  },
  "alt_std_rho": {
    "display": "+0.99",
    "estimand": "Spearman rank correlation between bin order and bin mean, each bin counted once",
    "note": "",
    "period": "births in 2018 to 2024",
    "population": "the bins of counties ranked by Standardized index",
    "source": "wonder-natality",
    "unit": "rank correlation",
    "value": 0.987879,
    "weights": "each bin counted once"
  },
  "births_2018": {
    "display": "3.79 million",
    "estimand": "count of live births",
    "note": "",
    "period": "2018",
    "population": "live births in the United States",
    "source": "wonder-natality",
    "unit": "live births",
    "value": 3791712,
    "weights": "none (full count)"
  },
  "births_2024": {
    "display": "3.63 million",
    "estimand": "count of live births",
    "note": "",
    "period": "2024",
    "population": "live births in the United States",
    "source": "wonder-natality",
    "unit": "live births",
    "value": 3628934,
    "weights": "none (full count)"
  },
  "births_covered": {
    "display": "20.5 million",
    "estimand": "count of live births",
    "n": 20450654,
    "nUnit": "births",
    "note": "",
    "period": "births in 2018 to 2024",
    "population": "live births in the counties that CDC WONDER natality names individually (counties of 100,000 residents or more)",
    "source": "wonder-natality",
    "unit": "live births",
    "value": 20450654,
    "weights": "none (full count)"
  },
  "births_decline_pct": {
    "display": "4.3%",
    "estimand": "fall in the count of births from 2018 to 2024",
    "note": "",
    "period": "2018 to 2024",
    "population": "live births in the United States",
    "source": "wonder-natality",
    "unit": "percent of 2018 births",
    "value": 4.29299,
    "weights": "none (full count)"
  },
  "births_median_all_d1": {
    "display": "12,055",
    "estimand": "median of the county birth counts behind the rate (CHR denominator)",
    "n": 304,
    "nUnit": "counties",
    "note": "",
    "period": "births in 2016 to 2022",
    "population": "the median county in the least deprived tenth of all counties with a County Health Rankings rate and an ADI",
    "source": "chr",
    "unit": "live births",
    "value": 12055,
    "weights": "none (each county counts once)"
  },
  "births_median_all_d10": {
    "display": "770",
    "estimand": "median of the county birth counts behind the rate (CHR denominator)",
    "n": 304,
    "nUnit": "counties",
    "note": "",
    "period": "births in 2016 to 2022",
    "population": "the median county in the most deprived tenth of all counties with a County Health Rankings rate and an ADI",
    "source": "chr",
    "unit": "live births",
    "value": 769.5,
    "weights": "none (each county counts once)"
  },
  "births_share_covered": {
    "display": "79.5%",
    "estimand": "share of births in the named counties",
    "n": 25709900,
    "nUnit": "births",
    "note": "",
    "period": "births in 2018 to 2024",
    "population": "live births in the 50 states and DC",
    "source": "wonder-natality",
    "unit": "percent of live births in the United States",
    "value": 79.5439,
    "weights": "none (full count)"
  },
  "chr_wonder_corr": {
    "ci": [
      0.98,
      0.987
    ],
    "ciLevel": 0.95,
    "display": "0.984",
    "estimand": "births-weighted correlation between the county low-birthweight share in WONDER and in County Health Rankings, county-cluster bootstrap interval",
    "n": 578,
    "nUnit": "counties",
    "note": "",
    "period": "WONDER births in 2018 to 2024 and CHR births in 2016 to 2022",
    "population": "the named counties",
    "source": "chr",
    "unit": "correlation coefficient",
    "value": 0.983993,
    "weights": "WONDER births in each county"
  },
  "counties_all_gradient": {
    "display": "3,040",
    "estimand": "count of counties",
    "note": "",
    "period": "births in 2016 to 2022",
    "population": "counties with a County Health Rankings low-birthweight rate and an ADI",
    "source": "chr",
    "unit": "counties",
    "value": 3040,
    "weights": "none (full count)"
  },
  "counties_below_floor": {
    "display": "145",
    "estimand": "count of counties with a rate but fewer than 20 low-birthweight births, which the map leaves as no data",
    "note": "",
    "period": "births in 2016 to 2022",
    "population": "counties and county equivalents on the map (50 states and DC)",
    "source": "chr",
    "unit": "counties",
    "value": 145,
    "weights": "none (full count)"
  },
  "counties_mapped": {
    "display": "2,900",
    "estimand": "count of counties with a rate and at least 20 low-birthweight births",
    "note": "",
    "period": "births in 2016 to 2022",
    "population": "counties and county equivalents on the map (50 states and DC)",
    "source": "chr",
    "unit": "counties",
    "value": 2900,
    "weights": "none (full count)"
  },
  "counties_no_rate": {
    "display": "98",
    "estimand": "count of counties for which County Health Rankings publishes no low-birthweight rate",
    "note": "",
    "period": "births in 2016 to 2022",
    "population": "counties and county equivalents on the map (50 states and DC)",
    "source": "chr",
    "unit": "counties",
    "value": 98,
    "weights": "none (full count)"
  },
  "counties_not_mapped": {
    "display": "243",
    "estimand": "count of counties with no rate or fewer than 20 low-birthweight births",
    "note": "",
    "period": "births in 2016 to 2022",
    "population": "counties and county equivalents on the map (50 states and DC)",
    "source": "chr",
    "unit": "counties",
    "value": 243,
    "weights": "none (full count)"
  },
  "counties_used": {
    "display": "578",
    "estimand": "count of counties",
    "note": "",
    "period": "births in 2018 to 2024",
    "population": "counties that WONDER natality names individually and that have births",
    "source": "wonder-natality",
    "unit": "counties",
    "value": 578,
    "weights": "none (full count)"
  },
  "deep_south_all_share": {
    "display": "14%",
    "estimand": "share of mapped counties in Alabama, Georgia, Louisiana, Mississippi and South Carolina",
    "n": 2900,
    "nUnit": "counties",
    "note": "",
    "period": "births in 2016 to 2022",
    "population": "all mapped counties",
    "source": "chr",
    "unit": "percent of counties",
    "value": 14.2069,
    "weights": "none (each county counts once)"
  },
  "deep_south_top_share": {
    "display": "64%",
    "estimand": "share of those counties in Alabama, Georgia, Louisiana, Mississippi and South Carolina",
    "n": 290,
    "nUnit": "counties",
    "note": "",
    "period": "births in 2016 to 2022",
    "population": "mapped counties in the highest tenth of low-birthweight shares",
    "source": "chr",
    "unit": "percent of counties",
    "value": 64.1379,
    "weights": "none (each county counts once)"
  },
  "im_black": {
    "ci": [
      10.1,
      10.5
    ],
    "ciLevel": 0.95,
    "display": "10.3 deaths per 1,000 live births",
    "estimand": "crude rate from state counts, normal interval",
    "n": 12953,
    "nUnit": "infant deaths",
    "note": "",
    "period": "births in 2018 and 2019",
    "population": "live births to Black mothers (single race, any ethnicity) in the United States, states with a published count",
    "source": "wonder-lbd",
    "unit": "infant deaths per 1,000 live births",
    "value": 10.3159,
    "weights": "none (crude rate from counts)"
  },
  "im_left_out_black": {
    "display": "13.6%",
    "estimand": "share of births in county-years whose deaths WONDER withholds, which the county view leaves out of deaths and births",
    "note": "",
    "period": "births in 2018 and 2019",
    "population": "live births to black mothers (single race, any ethnicity) in counties of 250,000 residents or more",
    "source": "wonder-lbd",
    "unit": "percent of live births",
    "value": 13.6446,
    "weights": "none (full counts of births)"
  },
  "im_left_out_white": {
    "display": "5.2%",
    "estimand": "share of births in county-years whose deaths WONDER withholds, which the county view leaves out of deaths and births",
    "note": "",
    "period": "births in 2018 and 2019",
    "population": "live births to white mothers (single race, any ethnicity) in counties of 250,000 residents or more",
    "source": "wonder-lbd",
    "unit": "percent of live births",
    "value": 5.18,
    "weights": "none (full counts of births)"
  },
  "im_white": {
    "ci": [
      4.7,
      4.8
    ],
    "ciLevel": 0.95,
    "display": "4.7",
    "estimand": "crude rate from state counts, normal interval",
    "n": 26516,
    "nUnit": "infant deaths",
    "note": "",
    "period": "births in 2018 and 2019",
    "population": "live births to white mothers (single race, any ethnicity) in the United States, states with a published count",
    "source": "wonder-lbd",
    "unit": "infant deaths per 1,000 live births",
    "value": 4.72059,
    "weights": "none (crude rate from counts)"
  },
  "lbd_county_threshold": {
    "display": "250,000",
    "estimand": "population size at which WONDER names a county in the linked file (a definition)",
    "note": "",
    "period": "births in 2018 and 2019",
    "population": "counties that CDC WONDER linked birth and infant death names individually",
    "source": "wonder-lbd",
    "unit": "residents",
    "value": 250000,
    "weights": "none (definition)"
  },
  "lbw_adi_corr": {
    "ci": [
      0.45,
      0.58
    ],
    "ciLevel": 0.95,
    "display": "0.52",
    "estimand": "births-weighted correlation of the county low-birthweight share with county deprivation rank, county-cluster bootstrap interval",
    "n": 578,
    "nUnit": "counties",
    "note": "",
    "period": "births in 2018 to 2024",
    "population": "live births in the named counties",
    "source": "wonder-natality",
    "unit": "correlation coefficient",
    "value": 0.520719,
    "weights": "births in each county"
  },
  "lbw_all_d1": {
    "ci": [
      7.4,
      7.8
    ],
    "ciLevel": 0.95,
    "display": "7.6%",
    "estimand": "births-weighted mean of county shares, bootstrap interval over counties",
    "n": 304,
    "nUnit": "counties",
    "note": "",
    "period": "births in 2016 to 2022",
    "population": "live births in the least deprived tenth of all counties with a County Health Rankings rate and an ADI",
    "source": "chr",
    "unit": "percent of live births under 2,500 grams",
    "value": 7.57629,
    "weights": "births in each county (CHR denominator)"
  },
  "lbw_all_d10": {
    "ci": [
      10.6,
      11.3
    ],
    "ciLevel": 0.95,
    "display": "10.9%",
    "estimand": "births-weighted mean of county shares, bootstrap interval over counties",
    "n": 304,
    "nUnit": "counties",
    "note": "",
    "period": "births in 2016 to 2022",
    "population": "live births in the most deprived tenth of all counties with a County Health Rankings rate and an ADI",
    "source": "chr",
    "unit": "percent of live births under 2,500 grams",
    "value": 10.9281,
    "weights": "births in each county (CHR denominator)"
  },
  "lbw_b1_w4_diff": {
    "ci": [
      4.4,
      5.2
    ],
    "ciLevel": 0.95,
    "display": "4.8 percentage points",
    "estimand": "difference of two pooled low-birthweight shares, county-cluster bootstrap interval",
    "n": 578,
    "nUnit": "counties",
    "note": "",
    "period": "births in 2016 to 2022",
    "population": "live births in the named counties: non-Hispanic Black mothers in the least deprived quartile minus non-Hispanic white mothers in the most deprived quartile",
    "source": "chr",
    "unit": "percentage points",
    "value": 4.79164,
    "weights": "births to mothers of the group in each county"
  },
  "lbw_black": {
    "ci": [
      13.8,
      14.2
    ],
    "ciLevel": 0.95,
    "display": "14.0%",
    "estimand": "pooled share of births, from the published county rates and the births they imply, bootstrap interval over counties",
    "n": 549,
    "nUnit": "counties",
    "note": "",
    "period": "births in 2016 to 2022",
    "population": "live births to non-Hispanic Black mothers in the named counties where County Health Rankings publishes the rate",
    "source": "chr",
    "unit": "percent of live births under 2,500 grams",
    "value": 13.9826,
    "weights": "births to mothers of the group in each county"
  },
  "lbw_black_q1": {
    "ci": [
      11.9,
      12.8
    ],
    "ciLevel": 0.95,
    "display": "12.4%",
    "estimand": "pooled share of births, bootstrap interval over counties",
    "n": 133,
    "nUnit": "counties",
    "note": "",
    "period": "births in 2016 to 2022",
    "population": "live births to non-Hispanic Black mothers in the least deprived quartile of the named counties by deprivation rank",
    "source": "chr",
    "unit": "percent of live births under 2,500 grams",
    "value": 12.3681,
    "weights": "births to mothers of the group in each county"
  },
  "lbw_cutoff_grams": {
    "display": "2,500",
    "estimand": "birthweight below which a live birth counts as low birthweight (a definition)",
    "note": "",
    "period": "all years (a definition)",
    "population": "live births",
    "source": "wonder-natality",
    "unit": "grams",
    "value": 2500,
    "weights": "none (definition)"
  },
  "lbw_d1": {
    "ci": [
      7.2,
      7.7
    ],
    "ciLevel": 0.95,
    "display": "7.4%",
    "estimand": "births-weighted mean of county shares (the pooled share), bootstrap interval over counties",
    "n": 57,
    "nUnit": "counties",
    "note": "",
    "period": "births in 2018 to 2024",
    "population": "live births in the least deprived tenth of the named counties by county deprivation rank",
    "source": "wonder-natality",
    "unit": "percent of live births under 2,500 grams",
    "value": 7.42965,
    "weights": "births in each county"
  },
  "lbw_d10": {
    "ci": [
      9.2,
      10.3
    ],
    "ciLevel": 0.95,
    "display": "9.7%",
    "estimand": "births-weighted mean of county shares (the pooled share), bootstrap interval over counties",
    "n": 58,
    "nUnit": "counties",
    "note": "",
    "period": "births in 2018 to 2024",
    "population": "live births in the most deprived tenth of the named counties by county deprivation rank",
    "source": "wonder-natality",
    "unit": "percent of live births under 2,500 grams",
    "value": 9.68228,
    "weights": "births in each county"
  },
  "lbw_gap_pp": {
    "ci": [
      7,
      7.4
    ],
    "ciLevel": 0.95,
    "display": "7.3 percentage points",
    "estimand": "difference of pooled low-birthweight shares, county-cluster bootstrap interval",
    "n": 578,
    "nUnit": "counties",
    "note": "",
    "period": "births in 2016 to 2022",
    "population": "live births in the named counties, non-Hispanic Black mothers minus non-Hispanic white mothers",
    "source": "chr",
    "unit": "percentage points",
    "value": 7.25025,
    "weights": "births to mothers of the group in each county"
  },
  "lbw_gap_q1": {
    "ci": [
      5.8,
      6.6
    ],
    "ciLevel": 0.95,
    "display": "6.2 percentage points",
    "estimand": "difference of pooled low-birthweight shares, county-cluster bootstrap interval",
    "n": 578,
    "nUnit": "counties",
    "note": "",
    "period": "births in 2016 to 2022",
    "population": "live births in the least deprived quartile of the named counties, non-Hispanic Black mothers minus non-Hispanic white mothers",
    "source": "chr",
    "unit": "percentage points",
    "value": 6.18677,
    "weights": "births to mothers of the group in each county"
  },
  "lbw_gap_q4": {
    "ci": [
      7.7,
      8.2
    ],
    "ciLevel": 0.95,
    "display": "8.0 percentage points",
    "estimand": "difference of pooled low-birthweight shares, county-cluster bootstrap interval",
    "n": 578,
    "nUnit": "counties",
    "note": "",
    "period": "births in 2016 to 2022",
    "population": "live births in the most deprived quartile of the named counties, non-Hispanic Black mothers minus non-Hispanic white mothers",
    "source": "chr",
    "unit": "percentage points",
    "value": 7.95287,
    "weights": "births to mothers of the group in each county"
  },
  "lbw_gap_widening": {
    "ci": [
      1.3,
      2.3
    ],
    "ciLevel": 0.95,
    "display": "1.8 percentage points",
    "estimand": "difference of two Black-white gaps in pooled low-birthweight shares, county-cluster bootstrap interval",
    "n": 578,
    "nUnit": "counties",
    "note": "",
    "period": "births in 2016 to 2022",
    "population": "live births in the named counties, gap between non-Hispanic Black and non-Hispanic white mothers in the most deprived quartile minus the gap in the least deprived quartile",
    "source": "chr",
    "unit": "percentage points",
    "value": 1.76611,
    "weights": "births to mothers of the group in each county"
  },
  "lbw_hispanic": {
    "ci": [
      7.4,
      7.7
    ],
    "ciLevel": 0.95,
    "display": "7.5%",
    "estimand": "pooled share of births, from the published county rates and the births they imply, bootstrap interval over counties",
    "n": 575,
    "nUnit": "counties",
    "note": "",
    "period": "births in 2016 to 2022",
    "population": "live births to Hispanic (any race) mothers in the named counties where County Health Rankings publishes the rate",
    "source": "chr",
    "unit": "percent of live births under 2,500 grams",
    "value": 7.54214,
    "weights": "births to mothers of the group in each county"
  },
  "lbw_natl": {
    "ci": [
      8.31,
      8.33
    ],
    "ciLevel": 0.95,
    "display": "8.3%",
    "estimand": "pooled share of births in published cells (events over births), Wilson interval",
    "n": 20406425,
    "nUnit": "births",
    "note": "WONDER withholds cells of 1 to 9 births; a withheld cell is left out of both the count and the denominator.",
    "period": "births in 2018 to 2024",
    "population": "live births in the counties that CDC WONDER natality names individually (counties of 100,000 residents or more), births in published cells",
    "source": "wonder-natality",
    "unit": "percent of live births under 2,500 grams",
    "value": 8.31974,
    "weights": "none (full counts of births)"
  },
  "lbw_preterm_corr": {
    "ci": [
      0.81,
      0.87
    ],
    "ciLevel": 0.95,
    "display": "0.84",
    "estimand": "births-weighted correlation between the county low-birthweight share and the county preterm share, county-cluster bootstrap interval",
    "n": 578,
    "nUnit": "counties",
    "note": "",
    "period": "births in 2018 to 2024",
    "population": "live births in the named counties",
    "source": "wonder-natality",
    "unit": "correlation coefficient",
    "value": 0.83989,
    "weights": "births in each county"
  },
  "lbw_range_pp": {
    "ci": [
      1.7,
      2.9
    ],
    "ciLevel": 0.95,
    "display": "2.3 percentage points",
    "estimand": "difference of two births-weighted decile means of the low-birthweight share, bootstrap interval over counties",
    "n": 578,
    "nUnit": "counties",
    "note": "",
    "period": "births in 2018 to 2024",
    "population": "live births in the named counties, most deprived tenth minus least deprived tenth",
    "source": "wonder-natality",
    "unit": "percentage points",
    "value": 2.25263,
    "weights": "births in each county"
  },
  "lbw_ratio_bw": {
    "ci": [
      2,
      2.1
    ],
    "ciLevel": 0.95,
    "display": "2.1",
    "estimand": "ratio of pooled low-birthweight shares, county-cluster bootstrap interval",
    "n": 578,
    "nUnit": "counties",
    "note": "",
    "period": "births in 2016 to 2022",
    "population": "live births in the named counties, non-Hispanic Black mothers over non-Hispanic white mothers",
    "source": "chr",
    "unit": "ratio of rates",
    "value": 2.07693,
    "weights": "births to mothers of the group in each county"
  },
  "lbw_rest": {
    "ci": [
      7.7,
      8
    ],
    "ciLevel": 0.95,
    "display": "7.8%",
    "estimand": "pooled share of births, bootstrap interval over counties",
    "n": 1529,
    "nUnit": "counties",
    "note": "",
    "period": "births in 2016 to 2022",
    "population": "live births in mapped counties outside the Census South region",
    "source": "chr",
    "unit": "percent of live births under 2,500 grams",
    "value": 7.82106,
    "weights": "births in each county (CHR denominator)"
  },
  "lbw_slope_per_10": {
    "ci": [
      0.32,
      0.44
    ],
    "ciLevel": 0.95,
    "display": "0.38 percentage points",
    "estimand": "births-weighted slope of the county low-birthweight share on county deprivation rank, county-cluster bootstrap interval",
    "n": 578,
    "nUnit": "counties",
    "note": "",
    "period": "births in 2018 to 2024",
    "population": "live births in the named counties",
    "source": "wonder-natality",
    "unit": "percentage points of the low-birthweight share per ten points of county deprivation rank",
    "value": 0.381377,
    "weights": "births in each county"
  },
  "lbw_south": {
    "ci": [
      9,
      9.3
    ],
    "ciLevel": 0.95,
    "display": "9.1%",
    "estimand": "pooled share of births, bootstrap interval over counties",
    "n": 1371,
    "nUnit": "counties",
    "note": "",
    "period": "births in 2016 to 2022",
    "population": "live births in mapped counties in the Census South region (16 states and DC)",
    "source": "chr",
    "unit": "percent of live births under 2,500 grams",
    "value": 9.14376,
    "weights": "births in each county (CHR denominator)"
  },
  "lbw_wh_low_d1": {
    "display": "1.0",
    "estimand": "withheld birthweight cells below the low-birthweight cutoff, per county-year",
    "n": 399,
    "nUnit": "county-years",
    "note": "",
    "period": "births in 2018 to 2024",
    "population": "county-years of the least deprived tenth of the named counties",
    "source": "wonder-natality",
    "unit": "withheld cells per county-year",
    "value": 1.00752,
    "weights": "none (full count)"
  },
  "lbw_wh_low_d10": {
    "display": "1.6",
    "estimand": "withheld birthweight cells below the low-birthweight cutoff, per county-year",
    "n": 406,
    "nUnit": "county-years",
    "note": "",
    "period": "births in 2018 to 2024",
    "population": "county-years of the most deprived tenth of the named counties",
    "source": "wonder-natality",
    "unit": "withheld cells per county-year",
    "value": 1.59852,
    "weights": "none (full count)"
  },
  "lbw_wh_max_d1": {
    "display": "0.2%",
    "estimand": "largest share of births the withheld birthweight cells could hold: 9 births in each withheld cell, over all births in these counties",
    "note": "",
    "period": "births in 2018 to 2024",
    "population": "live births in the least deprived tenth of the named counties",
    "source": "wonder-natality",
    "unit": "percent of live births",
    "value": 0.201067,
    "weights": "none (an upper limit from the cell count)"
  },
  "lbw_wh_max_d10": {
    "display": "1.3%",
    "estimand": "largest share of births the withheld birthweight cells could hold: 9 births in each withheld cell, over all births in these counties",
    "note": "",
    "period": "births in 2018 to 2024",
    "population": "live births in the most deprived tenth of the named counties",
    "source": "wonder-natality",
    "unit": "percent of live births",
    "value": 1.32519,
    "weights": "none (an upper limit from the cell count)"
  },
  "lbw_white": {
    "ci": [
      6.6,
      6.8
    ],
    "ciLevel": 0.95,
    "display": "6.7%",
    "estimand": "pooled share of births, from the published county rates and the births they imply, bootstrap interval over counties",
    "n": 578,
    "nUnit": "counties",
    "note": "",
    "period": "births in 2016 to 2022",
    "population": "live births to non-Hispanic white mothers in the named counties where County Health Rankings publishes the rate",
    "source": "chr",
    "unit": "percent of live births under 2,500 grams",
    "value": 6.73233,
    "weights": "births to mothers of the group in each county"
  },
  "lbw_white_q4": {
    "ci": [
      7.5,
      7.7
    ],
    "ciLevel": 0.95,
    "display": "7.6%",
    "estimand": "pooled share of births, bootstrap interval over counties",
    "n": 145,
    "nUnit": "counties",
    "note": "",
    "period": "births in 2016 to 2022",
    "population": "live births to non-Hispanic white mothers in the most deprived quartile of the named counties by deprivation rank",
    "source": "chr",
    "unit": "percent of live births under 2,500 grams",
    "value": 7.57649,
    "weights": "births to mothers of the group in each county"
  },
  "lbw_withheld_cells": {
    "display": "11,250",
    "estimand": "count of cells with 1 to 9 births, which WONDER withholds",
    "note": "",
    "period": "births in 2018 to 2024",
    "population": "county-year cells of the WONDER birthweight cut in the named counties",
    "source": "wonder-natality",
    "unit": "withheld cells",
    "value": 11250,
    "weights": "none (full count)"
  },
  "lbw_withheld_max_share": {
    "display": "0.5%",
    "estimand": "largest share of births the withheld birthweight cells could hold: 9 births in each withheld cell, over all births in the counties",
    "note": "",
    "period": "births in 2018 to 2024",
    "population": "live births in the named counties",
    "source": "wonder-natality",
    "unit": "percent of live births",
    "value": 0.495094,
    "weights": "none (an upper limit from the cell count)"
  },
  "map_floor_births": {
    "display": "20",
    "estimand": "fewest low-birthweight births for which a county is drawn (a floor set for this book)",
    "note": "",
    "period": "births in 2016 to 2022",
    "population": "counties on the map",
    "source": "chr",
    "unit": "low-birthweight births",
    "value": 20,
    "weights": "none (definition)"
  },
  "preterm_adi_corr": {
    "ci": [
      0.64,
      0.73
    ],
    "ciLevel": 0.95,
    "display": "0.69",
    "estimand": "births-weighted correlation of the county preterm share with county deprivation rank, county-cluster bootstrap interval",
    "n": 578,
    "nUnit": "counties",
    "note": "",
    "period": "births in 2018 to 2024",
    "population": "live births in the named counties",
    "source": "wonder-natality",
    "unit": "correlation coefficient",
    "value": 0.68578,
    "weights": "births in each county"
  },
  "preterm_cutoff_weeks": {
    "display": "37",
    "estimand": "gestational age below which a live birth counts as preterm, obstetric estimate (a definition)",
    "note": "",
    "period": "all years (a definition)",
    "population": "live births",
    "source": "wonder-natality",
    "unit": "completed weeks of gestation",
    "value": 37,
    "weights": "none (definition)"
  },
  "preterm_hi": {
    "ci": [
      11.3,
      12.7
    ],
    "ciLevel": 0.95,
    "display": "12.1%",
    "estimand": "births-weighted mean of county shares (the pooled share), bootstrap interval over counties",
    "n": 58,
    "nUnit": "counties",
    "note": "",
    "period": "births in 2018 to 2024",
    "population": "live births in the most deprived tenth of the named counties by county deprivation rank",
    "source": "wonder-natality",
    "unit": "percent of live births before 37 weeks",
    "value": 12.0537,
    "weights": "births in each county"
  },
  "preterm_lo": {
    "ci": [
      8.6,
      9
    ],
    "ciLevel": 0.95,
    "display": "8.8%",
    "estimand": "births-weighted mean of county shares (the pooled share), bootstrap interval over counties",
    "n": 57,
    "nUnit": "counties",
    "note": "",
    "period": "births in 2018 to 2024",
    "population": "live births in the least deprived tenth of the named counties by county deprivation rank",
    "source": "wonder-natality",
    "unit": "percent of live births before 37 weeks",
    "value": 8.81949,
    "weights": "births in each county"
  },
  "preterm_natl": {
    "ci": [
      10.08,
      10.11
    ],
    "ciLevel": 0.95,
    "display": "10.1%",
    "estimand": "pooled share of births in published cells (events over births), Wilson interval",
    "n": 20418250,
    "nUnit": "births",
    "note": "",
    "period": "births in 2018 to 2024",
    "population": "live births in the counties that CDC WONDER natality names individually (counties of 100,000 residents or more), births in published cells",
    "source": "wonder-natality",
    "unit": "percent of live births before 37 weeks",
    "value": 10.098,
    "weights": "none (full counts of births)"
  },
  "preterm_range_pp": {
    "ci": [
      2.5,
      3.9
    ],
    "ciLevel": 0.95,
    "display": "3.2 percentage points",
    "estimand": "difference of two births-weighted decile means of the preterm share, bootstrap interval over counties",
    "n": 578,
    "nUnit": "counties",
    "note": "",
    "period": "births in 2018 to 2024",
    "population": "live births in the named counties, most deprived tenth minus least deprived tenth",
    "source": "wonder-natality",
    "unit": "percentage points",
    "value": 3.2342,
    "weights": "births in each county"
  },
  "preterm_slope_per_10": {
    "ci": [
      0.44,
      0.55
    ],
    "ciLevel": 0.95,
    "display": "0.49 percentage points",
    "estimand": "births-weighted slope of the county preterm share on county deprivation rank, county-cluster bootstrap interval",
    "n": 578,
    "nUnit": "counties",
    "note": "",
    "period": "births in 2018 to 2024",
    "population": "live births in the named counties",
    "source": "wonder-natality",
    "unit": "percentage points of the preterm share per ten points of county deprivation rank",
    "value": 0.492342,
    "weights": "births in each county"
  },
  "preterm_withheld_cells": {
    "display": "8,704",
    "estimand": "count of cells with 1 to 9 births, which WONDER withholds",
    "note": "",
    "period": "births in 2018 to 2024",
    "population": "county-year cells of the WONDER gestational-age cut in the named counties",
    "source": "wonder-natality",
    "unit": "withheld cells",
    "value": 8704,
    "weights": "none (full count)"
  },
  "preterm_withheld_max_share": {
    "display": "0.4%",
    "estimand": "largest share of births the withheld gestational-age cells could hold: 9 births in each withheld cell, over all births in the counties",
    "note": "",
    "period": "births in 2018 to 2024",
    "population": "live births in the named counties",
    "source": "wonder-natality",
    "unit": "percent of live births",
    "value": 0.383049,
    "weights": "none (an upper limit from the cell count)"
  },
  "south_all_share": {
    "display": "47%",
    "estimand": "share of mapped counties in the Census South region (16 states and DC)",
    "n": 2900,
    "nUnit": "counties",
    "note": "",
    "period": "births in 2016 to 2022",
    "population": "all mapped counties",
    "source": "chr",
    "unit": "percent of counties",
    "value": 47.2759,
    "weights": "none (each county counts once)"
  },
  "south_top_share": {
    "display": "89%",
    "estimand": "share of those counties in the Census South region (16 states and DC)",
    "n": 290,
    "nUnit": "counties",
    "note": "",
    "period": "births in 2016 to 2022",
    "population": "mapped counties in the highest tenth of low-birthweight shares",
    "source": "chr",
    "unit": "percent of counties",
    "value": 89.3103,
    "weights": "none (each county counts once)"
  },
  "wonder_suppression_floor": {
    "display": "10",
    "estimand": "a cell with fewer births than this is withheld (a definition)",
    "note": "",
    "period": "births in 2018 to 2024",
    "population": "cells of the WONDER natality files",
    "source": "wonder-natality",
    "unit": "births",
    "value": 10,
    "weights": "none (definition)"
  },
  "wonder_threshold": {
    "display": "100,000",
    "estimand": "population size at which WONDER names a county (a definition)",
    "note": "",
    "period": "births in 2018 to 2024",
    "population": "counties that CDC WONDER natality names individually",
    "source": "wonder-natality",
    "unit": "residents",
    "value": 100000,
    "weights": "none (definition)"
  }
}