TABLE 1.
Infant Baseline Characteristics
| Characteristics | All Infants (N = 18 616) | White (N = 5010) | African American (N = 2530) | Hispanic (N = 8191) | Asian American (N = 2357) | Other (N = 474) | P | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| n/N | % | n/N | % | n/N | % | n/N | % | n/N | % | n/N | % | ||
| Birth weight (g) | |||||||||||||
| <751 | 1654/18 616 | 9 | 389/5010 | 8 | 292/2530 | 12 | 749/8191 | 9 | 172/2357 | 7 | 46/474 | 10 | .401 |
| 751–1000 | 4284/18 616 | 23 | 1082/5010 | 22 | 643/2530 | 25 | 1915/8191 | 23 | 511/2357 | 22 | 119/474 | 25 | — |
| 1001–1250 | 5358/18 616 | 29 | 1434/5010 | 29 | 719/2530 | 28 | 2393/8191 | 29 | 668/2357 | 28 | 128/474 | 27 | — |
| 1251–1500 | 7320/18 616 | 39 | 2105/5010 | 42 | 876/2530 | 35 | 3134/8191 | 38 | 1006/2357 | 43 | 181/474 | 38 | — |
| Gestational age (wk) | |||||||||||||
| 25–27 | 5843/18 616 | 31 | 1442/5010 | 29 | 841/2530 | 33 | 2740/8191 | 33 | 640/2357 | 27 | 159/474 | 34 | <.001 |
| 28–29 | 5359/18 616 | 29 | 1485/5010 | 30 | 718/2530 | 28 | 2349/8191 | 29 | 681/2357 | 29 | 112/474 | 24 | — |
| >29 | 7414/18 616 | 40 | 2083/5010 | 42 | 971/2530 | 38 | 3102/8191 | 38 | 1036/2357 | 44 | 203/474 | 43 | — |
| Boy | 9494/18 615 | 51 | 2556/5009 | 51 | 1234/2530 | 49 | 4247/8191 | 52 | 1193/2357 | 51 | 237/474 | 50 | .103 |
| Prenatal care | 17 950/18 566 | 97 | 4820/5004 | 96 | 2382/2522 | 94 | 7912/8160 | 97 | 2322/2354 | 99 | 466/472 | 99 | <.001 |
| Multiple gestation | 5132/18 615 | 28 | 1941/5010 | 39 | 669/2530 | 26 | 1655/8190 | 20 | 726/2357 | 31 | 123/474 | 26 | <.001 |
| Cesarean delivery | 14 163/18 616 | 76 | 3959/5010 | 79 | 1902/2530 | 75 | 6101/8191 | 74 | 1791/2357 | 76 | 368/474 | 78 | <.001 |
| SGA | 4761/18 616 | 26 | 1209/5010 | 24 | 547/2530 | 22 | 2233/8191 | 27 | 642/2357 | 27 | 129/474 | 27 | <.001 |
| Maternal age (y) | |||||||||||||
| <20 | 1374/18 607 | 7 | 202/5004 | 4 | 242/2530 | 10 | 850/8189 | 10 | 53/2357 | 2 | 24/474 | 5 | <.001 |
| 20–29 | 7511/18 607 | 40 | 1816/5004 | 36 | 1233/2530 | 49 | 3700/8189 | 45 | 567/2357 | 24 | 179/474 | 38 | — |
| 30–39 | 8429/18 607 | 45 | 2566/5004 | 51 | 917/2530 | 36 | 3205/8189 | 39 | 1468/2357 | 62 | 245/474 | 52 | — |
| >39 | 1293/18 607 | 7 | 420/5004 | 8 | 138/2530 | 5 | 434/8189 | 5 | 269/2357 | 11 | 26/474 | 5 | — |
| 5-min Apgar score | |||||||||||||
| 0–3 | 618/18 523 | 3 | 150/4992 | 3 | 106/2513 | 4 | 296/8143 | 4 | 49/2352 | 2 | 12/470 | 3 | <.001 |
| 4–6 | 2518/18 523 | 14 | 654/4992 | 13 | 430/2513 | 17 | 1084/8143 | 13 | 285/2352 | 12 | 61/470 | 13 | — |
| 7–10 | 15 387/18 523 | 83 | 4188/4992 | 84 | 1977/2513 | 79 | 6763/8143 | 83 | 2018/2352 | 86 | 397/470 | 84 | — |
| Transferred in | 1621/18 616 | 9 | 466/5010 | 9 | 172/2530 | 7 | 796/8191 | 10 | 115/2357 | 5 | 61/474 | 13 | <.001 |
| Antenatal steroids | 15 517/17 786 | 87 | 4236/4775 | 89 | 2069/2420 | 85 | 6819/7864 | 87 | 1976/2234 | 88 | 376/443 | 85 | <.001 |
| Hypothermia | 1694/18 465 | 9 | 417/4979 | 8 | 255/2508 | 10 | 695/8117 | 9 | 266/2334 | 11 | 57/473 | 12 | <.001 |
| Pneumothorax | 551/18 613 | 3 | 208/5010 | 4 | 52/2529 | 2 | 213/8190 | 3 | 53/2356 | 2 | 24/474 | 5 | <.001 |
| HAI | 1355/18 338 | 7 | 320/4931 | 6 | 186/2490 | 7 | 651/8062 | 8 | 152/2337 | 7 | 41/466 | 9 | .004 |
| CLD | 3408/17 636 | 19 | 898/4756 | 19 | 443/2394 | 19 | 1569/7720 | 20 | 395/2264 | 17 | 94/450 | 21 | .015 |
| Timely eye examination | 12 255/12 896 | 95 | 3259/3401 | 96 | 1663/1766 | 94 | 5495/5809 | 95 | 1508/1571 | 96 | 295/313 | 94 | .011 |
| Any human milk at DC | 12 306/18 612 | 66 | 3543/5010 | 71 | 1301/2530 | 51 | 5295/8187 | 65 | 1818/2357 | 77 | 320/474 | 68 | <.001 |
| In-hospital mortality | 773/18 558 | 4 | 203/4996 | 4 | 110/2523 | 4 | 357/8160 | 4 | 80/2351 | 3 | 20/474 | 4 | .320 |
| High growth velocity | 7851/15 650 | 50 | 2175/4241 | 51 | 1226/2085 | 59 | 3212/6880 | 47 | 1037/2025 | 51 | 192/404 | 48 | <.001 |
CLD, chronic lung disease; DC, discharge; HAI, health care–associated infection; SGA, small for gestational age (<10th Percentile); —, not applicable.