TABLE 1.
County-level pregnancy and sociodemographic characteristics of SEER 9 counties (N=194)
| 1975–1980 | 2008–2013 | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
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| County-Level Characteristic | Mean | SD | 25th Pct | Median | 75th Pct | Mean | SD | 25th Pct | Median | 75th Pct | Pa |
| Average maternal age (years) | 24.8 | 0.7 | 24.3 | 24.7 | 25.1 | 27.0 | 1.4 | 26.2 | 26.9 | 27.6 | <0.001 |
| Average birthweight (grams) | 3361 | 102 | 3312 | 3388 | 3434 | 3300 | 89 | 3238 | 3320 | 3366 | <0.001 |
| Average live birth order | 2.2 | 0.3 | 2.0 | 2.1 | 2.4 | 2.2 | 0.2 | 2.1 | 2.1 | 2.3 | 0.08 |
| % White | 95.0 | 10.5 | 95.6 | 98.8 | 99.5 | 89.4 | 13.3 | 87.0 | 94.5 | 97.1 | <0.001 |
| % Hispanic | 9.8 | 19.0 | 0.4 | 1.5 | 5.1 | 19.2 | 21.2 | 4.5 | 10.8 | 24.0 | <0.001 |
| % Poverty | 13.5 | 6.4 | 9.4 | 12.1 | 15.3 | 13.5 | 5.1 | 9.9 | 12.5 | 16.2 | 0.99 |
Abbreviations: SD, standard deviation; Pct., percentile; %white, proportion of children, ages 0–4 years, classified as white within county; %Hispanic, proportion of children, ages 0–4 years, classified as Hispanic within county; %poverty, proportion of residents, all ages, classified below the federal poverty line within county
a
P-value compares county-level means between first and last six years of the study period; estimated from paired t-test.