Table 1. Maternal age-specific demographic and pregnancy characteristics, singleton births, Washington State, US, 2003–2013.
| Characteristic | Maternal age | ||||||
|---|---|---|---|---|---|---|---|
| 15–19 y (n = 62,904) | 20–24 y (n = 186,537) | 25–29 y (n = 239,319) | 30–34 y (n = 209,936) | 35–39 y (n = 104,985) | 40–44 y (n = 23,180) | ≥45 y (n = 1,408) | |
| Race | |||||||
| Non-Hispanic white | 40,533 (64.7) | 132,907 (71.5) | 174,700 (73.2) | 152,104 (72.7) | 75,236 (71.9) | 16,565 (71.8) | 1,012 (72.2) |
| African-American | 3,253 (5.2) | 8,797 (4.7) | 9,206 (3.9) | 6,984 (3.3) | 3,691 (3.5) | 968 (4.2) | 93 (6.6) |
| Native American | 2,829 (4.5) | 5,568 (3.0) | 4,418 (1.9) | 2,588 (1.2) | 1,139 (1.1) | 241 (1.0) | 6 (0.4) |
| Hispanic | 13,579 (21.7) | 27,953 (15.0) | 26,397 (11.1) | 18,492 (8.8) | 8,800 (8.4) | 1,937 (8.4) | 102 (7.3) |
| Other | 2,461 (3.9) | 10,728 (5.8) | 23,877 (10.0) | 29,110 (13.9) | 15,749 (15.1) | 3,353 (14.5) | 189 (13.5) |
| Maternal education less than high school | 2,482 (4.0) | 6,983 (3.7) | 9,274 (3.9) | 8,494 (4.1) | 4,794 (4.6) | 1,239 (5.4) | 90 (6.4) |
| Smoking during pregnancy | 10,365 (16.6) | 29,038 (15.7) | 22,478 (9.5) | 11,599 (5.6) | 4,866 (4.7) | 1,166 (5.1) | 46 (3.3) |
| Not married | 52,238 (83.9) | 29,038 (54.5) | 22,478 (27.6) | 11,599 (16.4) | 4,866 (15.0) | 1,166 (17.7) | 246 (17.7) |
| Medical insurance | |||||||
| Medicaid | 45,416 (72.2) | 109,433 (58.7) | 89,201 (37.3) | 52,294 (24.9) | 23,144 (22.5) | 5,579 (24.1) | 329 (23.4) |
| Self-pay | 514 (0.2) | 1,548 (0.8) | 2,156 (0.9) | 2,143 (1.0) | 1,149 (1.1) | 275 (1.2) | 28 (2.0) |
| Private | 10,379 (16.5) | 54,428 (29.2) | 127,256 (53.2) | 140,398 (66.9) | 73,327 (69.9) | 15,640 (67.5) | 930 (66.1) |
| Other (including government)a | 4,987 (7.9) | 15,923 (8.5) | 13,451 (5.6) | 8,248 (3.9) | 3,576 (3.4) | 806 (3.5) | 54 (3.8) |
| Parity | |||||||
| Nullipara | 51,560 (82.4) | 95,289 (51.4) | 90,681 (38.1) | 65,638 (31.4) | 26,904 (25.8) | 5,323 (23.2) | 384 (27.7) |
| Multipara (1–3 previous births) | 9,802 (15.6) | 85,499 (45.8) | 135,387 (56.6) | 126,691 (60.4) | 65,033 (62.0) | 13,318 (57.5) | 636 (45.2) |
| Grand multipara (≥4 previous births) | 1,186 (1.9) | 4,642 (2.5) | 12,051 (5.0) | 16,560 (7.9) | 12,380 (11.8) | 4,334 (18.7) | 369 (26.2) |
| Body mass index (kg/m2) | |||||||
| Underweight (<18.5) | 3,247 (5.2) | 6,979 (3.7) | 6,425 (2.7) | 4,843 (2.3) | 2,096 (2.0) | 408 (1.8) | 21 (1.5) |
| Normal (18.5–24.9) | 30,641 (48.7) | 76,922 (41.2) | 99,556 (41.6) | 91,332 (43.5) | 44,586 (42.5) | 9,292 (40.1) | 539 (38.3) |
| Overweight (25.0–29.9) | 13,251 (21.1) | 42,713 (22.9) | 56,258 (23.5) | 48,809 (23.3) | 24,871 (23.7) | 5,714 (24.7) | 375 (26.6) |
| Obese (≥30) | 9,007 (14.3) | 41,132 (22.1) | 53,752 (22.5) | 43,535 (20.7) | 21,885 (20.9) | 5,154 (22.2) | 287 (20.4) |
| Missing | 6,758 (10.7) | 18,791 (10.1) | 23,328 (9.8) | 21,417 (10.2) | 11,547 (11.0) | 2,612 (11.3) | 186 (13.2) |
| Assisted conception | 5 (<0.1) | 223 (0.1) | 1,330 (0.6) | 2,462 (1.2) | 2,182 (2.1) | 948 (4.2) | 252 (18.3) |
| Diabetes mellitus (type 1 and 2) | 187 (0.3) | 994 (0.5) | 1,822 (0.8) | 2,205 (1.1) | 1,592 (1.5) | 483 (2.1) | 24 (1.7) |
| Chronic hypertension | 255 (0.4) | 1,360 (0.7) | 2,710 (1.2) | 3,097 (1.5) | 2,277 (2.2) | 799 (3.5) | 71 (5.2) |
| Neonatal sex (male) | 32,198 (51.2) | 95,679 (51.3) | 123,025 (51.4) | 107,840 (51.4) | 53,808 (51.3) | 11,747 (50.7) | 710 (50.4) |
| Congenital anomalies (any) | 3,769 (6.0) | 10,634 (5.7) | 13,775 (5.8) | 12,813 (6.1) | 6,934 (6.6) | 1,673 (7.2) | 106 (8.0) |
Data given as n (percent). The percentages for some characteristics do not add up to 100% due to missing values; missing values <3% are not shown.
aOther medical insurance includes other government insurance, student insurance, Indian Health Care, other programs, or no insurance.