Table. Baseline Characteristics of Counties Included in the Estimation Sample, Stratified by Exposure Statusa.
| Baseline Characteristics | Mean (SD) Value | |
|---|---|---|
| Closure | No Closure | |
| Opioid overdose mortality rate (per 100 000 adults aged 18-65 y) | 0.9 (1.4) | 1.0 (2.1) |
| Working-age adults (18-65 y) in the county population, % | 60.6 (1.4) | 61.0 (1.5) |
| Non-Hispanic white adults in the county population, % | 84.9 (18.8) | 91.1 (10.7) |
| County-level unemployment rate, % | 3.2 (0.8) | 3.2 (0.8) |
| Adults in the county population who completed college, % | 12.3 (3.2) | 12.5 (3.7) |
| Household income (median, 2000), $b | 45 977 (7513) | 44 893 (6781) |
| Households in the county below 100% of the federal poverty line, % | 9.6 (4.1) | 9.3 (3.7) |
| No. of counties | 29 | 83 |
a
Opioid overdose mortality rates are based on data from 2001, the year immediately preceding the first automotive plant closure in the sample. All other county-level variables are derived from the 2000 US Census, calculated as the percentage of individuals aged 16 years or older.
b
Median value within the county (county-level median), but the mean and the SD refer to the means and variation of median income levels across sample counties.