TABLE 1—
Descriptive Statistics of White, Black, and Hispanic Mothers and Their Infants Born in 2000: US Linked Birth and Infant Death Data Set, 2000
| Variable | White Mothers, No. (%) or Mean ±SD | Black Mothers, No. (%) or Mean ±SD | Hispanic Mothers, No. (%) or Mean ±SD |
| Mortality | |||
| Surviving | 2 263 055 (99.51) | 574 078 (98.78) | 759 442 (99.51) |
| Died | 11 192 (0.49) | 7073 (1.22) | 3759 (0.49) |
| Birth weight, g | |||
| ≥ 2500 | 2 161 120 (95.13) | 515 056 (88.71) | 722 148 (94.67) |
| < 2500 | 110 656 (4.87) | 65 556 (11.29) | 40 678 (5.33) |
| Gestational age | |||
| Term birth | 1 937 008 (91.47) | 446 193 (84.42) | 624 512 (89.83) |
| Preterm birth | 180 654 (8.53) | 82 321 (15.58) | 70 725 (10.17) |
| Smoking status | |||
| Nonsmoker | 2 964 205 (89.20) | 494 008 (91.81) | 493 940 (97.12) |
| Smoker | 358 872 (10.80) | 44 044 (8.19) | 14 627 (2.88) |
| Parity | |||
| 1 | 952 100 (42.01) | 220 620 (38.09) | 285 348 (37.59) |
| 2 | 763 874 (33.71) | 171 655 (29.64) | 231 326 (30.47) |
| 3 | 359 481 (15.86) | 102 106 (17.63) | 141 863 (18.69) |
| 4 | 122 160 (5.39) | 46 553 (8.04) | 60 755 (8.00) |
| ≥ 5 | 68 655 (3.03) | 38 227 (6.60) | 39 885 (5.25) |
| Maternal age, y | |||
| < 15 | 1801 (0.08) | 3674 (0.63) | 2479 (0.32) |
| 15–19 | 200 249 (8.81) | 113 132 (19.47) | 122 280 (16.02) |
| 20–24 | 511 174 (22.48) | 190 038 (32.70) | 232 515 (30.47) |
| 25–29 | 628 805 (27.65) | 131 655 (22.66) | 204 255 (26.77) |
| 30–34 | 588 743 (25.89) | 87 092 (14.99) | 131 245 (17.20) |
| 35–39 | 285 900 (12.57) | 45 144 (7.77) | 57 879 (7.58) |
| 40–54 | 57 303 (2.52) | 10 333 (1.78) | 12 445 (1.63) |
| Maternal education, y | |||
| 0–8 | 38 253 (1.70) | 13 743 (2.40) | 161 846 (21.67) |
| 9–11 | 241 412 (10.70) | 131 901 (23.08) | 207 902 (27.84) |
| 12 | 701 506 (31.10) | 227 898 (39.88) | 222 386 (29.78) |
| 13–15 | 550 590 (24.41) | 131 674 (23.04) | 99 202 (13.28) |
| ≥ 16 | 723 825 (32.09) | 66 261 (11.59) | 55 525 (7.43) |
| Marital status | |||
| Married | 1 765 905 (77.67) | 180 461 (31.06) | 440 331 (57.72) |
| Unmarried | 507 725 (22.33) | 400 523 (68.94) | 322 602 (42.28) |
| Maternal nativity | |||
| US | 2 149 559 (94.70) | 517 678 (89.52) | 289 767 (38.06) |
| Outside US | 120 201 (5.30) | 60 621 (10.48) | 471 653 (61.94) |
| Hispanic density, % | |||
| 0.00–0.99 | 644 995 (28.36) | 133 414 (22.96) | 12 407 (1.63) |
| 1.00–4.99 | 1 005 200 (44.20) | 252 790 (43.50) | 118 567 (15.54) |
| 5.00–14.99 | 531 441 (23.37) | 149 503 (25.73) | 365 678 (47.91) |
| 15.00–49.99 | 89 049 (3.92) | 45 160 (7.77) | 221 268 (28.99) |
| ≥ 50.00 | 3562 (0.16) | 284 (0.05) | 45 281 (5.93) |
| Black density, % | |||
| 0.00–0.99 | 422 818 (18.59) | 2594 (0.45) | 80 326 (10.52) |
| 1.00–4.99 | 589 648 (25.93) | 25 928 (4.46) | 183 365 (24.03) |
| 5.00–14.99 | 733 951 (32.27) | 147 376 (25.36) | 313 446 (41.07) |
| 15.00–49.99 | 506 483 (22.27) | 344 618 (59.30) | 182 062 (23.86) |
| ≥ 50.00 | 21 347 (0.94) | 60 635 (10.43) | 4002 (0.52) |
| Median income, in $10 000s | 4.39 ±1.10 | 4.09 ±0.97 | 4.33 ±1.03 |