Table 1.
Description of United States county-level variables with unweighted means (SD), interquartile ranges and sources.
| Variable | Description | Mean (SD) | IQR | Source | |
|---|---|---|---|---|---|
|
|
(Number of people 85–94 years old in 2010 divided by number of people 55–64 years old in 1980) × 10,000 | 2,295 (779.5) | 728.52 | U.S. Census Bureau 2010 U.S. Census Bureau 1980 | |
|
|
(Number of people 100–104 years old in 2010 divided by number of people 70–74 years old in 1980) × 10,000 | 71.4 (55.3) | 56.30 | U.S. Census Bureau 2010 U.S. Census Bureau 1980 | |
| PM2.5 | Mean PM2.5 concentrations from 1999–2008 (μg/m3) | 10.4 (2.8) | 4.19 | Beckerman et al. 2013 | |
| Percent smoking | Percentage of adults in county that smoked daily in 2000 | 21.5 (3.7) | 4.77 | Institute for Health Metrics and Evaluation 2014 | |
| Obesity prevalence | Average, age-adjusted percentage of population that was obese (data from 2004–2010) | 28.1 (3.6) | 3.53 | CDC 2013 | |
| Median income | Median income in 1999 (in thousands of U.S. dollars) | 35.3 (8.8) | 9.60 | U.S. Census Bureau 2000 | |
| Percent below poverty | Percentage of population below poverty line | 13.3 (5.6) | 6.90 | U.S. Census Bureau 2000 | |
| Percent black | Percentage of population that was black in 2000 | 8.9 (14.6) | 10.04 | U.S. Census Bureau 2000 | |
| Percent Hispanic | Percentage of population that was Hispanic in 2000 | 6.2 (12.1) | 4.19 | U.S. Census Bureau 2000 | |
| Population density | Thousands of people per square mile in 2000 | 0.25 (1.67) | 0.09 | U.S. Census Bureau 2000 | |
| Percent urban | Percentage of population that live in urban areas in 2000 | 40.2 (30.9) | 53.69 | U.S. Census Bureau 2000 | |
| Percent high school graduate | Percentage of population that were high school graduates | 77.3 (8.7) | 12.70 | U.S. Census Bureau 2000 | |
| Percent unemployed | Percentage of population that was unemployed | 5.8 (2.7) | 2.90 | U.S. Census Bureau 2000 | |
| Population in 2000 | Number of people living in a county in 2000 | 89,927 (293,515) | 50,742 | U.S. Census Bureau 2000 | |
| Median age | Median age for county in 2000 (years) | 37.4 (4.0) | 4.60 | U.S. Census Bureau 2000 | |
| Percent < 65 years old | Percentage of population > 65 years old in 2000 | 14.8 (4.1) | 4.97 | U.S. Census Bureau 2000 | |
| Migration 1980, 55- to 60-year-olds | Migration rate for 55- to 60-year-olds in 1980sa | 4.7 (18.9) | 12.00 | Winkler et al. 2013 | |
| Migration 1980, 60- to 64-year-olds | Migration rate for 60- to 64-year-olds in 1980sa | 7.4 (22.3) | 14.00 | Winkler et al. 2013 | |
| Migration 1980, 70- to 74-year-olds | Migration rate for 70- to 74-year-olds in 1980sa | 1.9 (13.5) | 10.00 | Winkler et al. 2013 | |
| Migration 1980, ≥ 75-year-olds | Migration rate for ≥ 75-year-olds in 1980sa | –0.43 (10.2) | 10.00 | Winkler et al. 2013 | |
| Migration 1990, 65- to 70-year-olds | Migration rate for 65- to 70-year-olds in 1990sa | 10.1 (20.5) | 17.00 | Winkler et al. 2013 | |
| Migration 1990, 70- to 74-year-olds | Migration rate for 70- to 74-year-olds in 1990sa | 4.2 (13.3) | 12.00 | Winkler et al. 2013 | |
| Migration 1990, ≥ 75-year-olds | Migration rate for ≥ 75-year-olds in 1990sa | –0.17 (14.0) | 13.00 | Winkler et al. 2013 | |
| Migration 2000, ≥ 75-year-olds | Migration rate for ≥ 75-year-olds in 2000sa | –0.81 (17.2) | 15.00 | Winkler et al. 2013 | |
| Abbreviations: IQR, interquartile range; PM2.5, particulate matter with aerodynamic diameter < 2.5 μm; SD, standard deviation. aAge-specific migration rates calculated as (net migration over the given decade divided by expected population at the end of the decade) times 100, where net migration is observed final population minus expected final population. | |||||