Table 1.
Maternal and infant characteristics for all births, PTBs and SGA term births, Harris County, Texas, 2005–2007
| Characteristic | All births | PTBs | n (%) | Term births | SGA term births | n (%) |
|---|---|---|---|---|---|---|
| Totals | 177,816 | 18,489 | 159,327 | 17,220 | ||
| Maternal race/ethnicity | ||||||
| Non-hispanic white | 40,572 | 3,997 | (9.9) | 36,575 | 2,883 | (7.9) |
| African-American/Black | 33,281 | 5,099 | (15.3) | 28,182 | 4,733 | (16.8) |
| Hispanic white, US born | 34,204 | 3,556 | (10.4) | 30,648 | 3,253 | (10.6) |
| Hispanic white, foreign born | 58,937 | 4,872 | (8.3) | 54,065 | 4,912 | (9.1) |
| Other | 10,822 | 965 | (8.9) | 9,857 | 1,439 | (14.6) |
| Maternal age (years) | ||||||
| ≤16 | 4,101 | 489 | (11.9) | 3,612 | 583 | (16.1) |
| 17–19 | 18,383 | 2,032 | (11.1) | 16,351 | 2,410 | (14.7) |
| 20–24 | 46,407 | 4,786 | (10.3) | 41,621 | 5,135 | (12.3) |
| 25–29 | 48,512 | 4,653 | (9.6) | 43,859 | 4,406 | (10.1) |
| 30–34 | 38,164 | 3,856 | (10.1) | 34,308 | 3,001 | (8.8) |
| 35–39 | 18,174 | 2,111 | (11.6) | 16,063 | 1,315 | (8.2) |
| ≥40 | 4,073 | 562 | (13.8) | 3,511 | 369 | (10.5) |
| Missing | 2 | 0 | (0.0) | 2 | 1 | (50.0) |
| Parity | ||||||
| First birth | 68,405 | 7,239 | (10.6) | 61,166 | 8,343 | (13.6) |
| Second or subsequent birth | 109,355 | 11,240 | (10.3) | 98,115 | 8,870 | (9.0) |
| Missing | 56 | 10 | (17.9) | 46 | 7 | (15.2) |
| Infant sex | ||||||
| Male | 90,745 | 9,980 | (11.0) | 80,765 | 9,078 | (11.2) |
| Female | 87,071 | 8,509 | (9.8) | 78,562 | 8,142 | (10.4) |
| Maternal education (years) | ||||||
| <12 | 65,684 | 6,505 | (9.9) | 59,179 | 6,714 | (11.4) |
| High school graduate or GED | 41,530 | 4,524 | (10.9) | 37,006 | 4,486 | (12.1) |
| 13–15 | 37,667 | 4,328 | (11.5) | 33,339 | 3,493 | (10.5) |
| 16+ | 32,725 | 3,078 | (9.4) | 29,647 | 2,503 | (8.4) |
| Missing | 210 | 54 | (25.7) | 156 | 24 | (15.4) |
| Source of payment for delivery | ||||||
| Private insurance | 62,906 | 6,608 | (10.5) | 56,298 | 4,901 | (8.7) |
| Medicaid | 64,225 | 7,226 | (11.3) | 56,999 | 7,563 | (13.3) |
| Self-pay | 38,424 | 3,422 | (8.9) | 35,002 | 3,707 | (10.6) |
| Other | 11,900 | 1,197 | (10.1) | 10,703 | 1,018 | (9.5) |
| Unknown | 361 | 36 | (10.0) | 325 | 31 | (9.5) |
| Mother on WIC during pregnancy | ||||||
| No | 84,708 | 9,472 | (11.2) | 75,236 | 7,436 | (9.9) |
| Yes | 92,663 | 8,939 | (9.7) | 83,724 | 9,742 | (11.6) |
| Missing | 445 | 78 | (17.5) | 367 | 42 | (11.4) |
| Father support | ||||||
| Married | 102,547 | 9,713 | (9.5) | 92,834 | 8,426 | (9.1) |
| Unmarried, with father’s support | 47,311 | 4,984 | (10.5) | 42,327 | 5,139 | (12.1) |
| Unmarried, no father’s support | 27,958 | 3,792 | (13.6) | 24,166 | 3,655 | (15.1) |
| Trimester prenatal care began | ||||||
| 1st trimester | 99,937 | 9,827 | (9.8) | 90,110 | 9,031 | (10.0) |
| 2nd trimester | 48,719 | 4,382 | (9.0) | 44,337 | 4,984 | (11.2) |
| 3rd trimester or none | 20,831 | 2,807 | (13.5) | 18,024 | 2,464 | (13.7) |
| Missing | 8,329 | 1,473 | (17.7) | 6,856 | 741 | (10.8) |
| Maternal smoking | ||||||
| No smoking | 169,527 | 17,384 | (10.3) | 152,143 | 16,050 | (10.6) |
| Stopped smoking trimester 1 or 2 | 3,503 | 380 | (10.9) | 3,123 | 361 | (11.6) |
| Smoked throughout pregnancy | 4,472 | 674 | (15.1) | 3,798 | 763 | (20.1) |
| Missing | 314 | 51 | (16.2) | 263 | 46 | (17.5) |
| Pre-pregnancy BMI (kg/m2) | ||||||
| Normal (18.5–24.9) | 86,877 | 8,689 | (10.0) | 78,188 | 9,205 | (11.8) |
| Underweight (<18.5) | 7,287 | 834 | (11.5) | 6,453 | 1,205 | (18.7) |
| Overweight (25.0–29.9) | 49,550 | 4,964 | (10.0) | 44,586 | 4,189 | (9.4) |
| Obese (≥30) | 33,127 | 3,801 | (11.5) | 29,326 | 2,526 | (8.6) |
| Missing | 975 | 201 | (20.6) | 774 | 95 | (12.3) |
PTB preterm birth, SGA small for gestational age, US United States, GED certificate of high school equivalency, WIC Women, Infants, and Children, BMI body mass index