Table 1.
Comparison of baseline characteristics among Caucasian, African American and Asian American groups (N=9185)
| White (N=5580) |
Black (N=3252) |
Asian (N=353) |
P | |
|---|---|---|---|---|
| Gestational age (weeks) | ||||
| Mean (SD) | 28.6 (2.6) | 28.2 (2.7) | 29.1 (2.8) | <0.001 |
| Median | 28.7 | 28.0 | 29.1 | |
| Q1, Q3 | 26.7, 30.6 | 26.0, 30.3 | 27.0, 31.1 | |
| Range | (22.0-37.6) | (22.3-38.1) | (22.4-35.1) | |
| 22 | 23 (0.4%) | 7 (0.2%) | 1 (0.3%) | |
| 23 | 160 (2.9%) | 135 (4.2%) | 6 (1.7%) | |
| 24 | 350 (6.3%) | 303 (9.3%) | 23 (6.5%) | |
| 25 | 427 (7.7%) | 325 (10.0%) | 28 (7.9%) | |
| 26 | 578 (10.4%) | 365 (11.2%) | 26 (7.4%) | |
| 27 | 664 (11.9%) | 397 (12.2%) | 31 (8.8%) | |
| 28 | 697 (12.5%) | 406 (12.5%) | 38 (10.8%) | |
| 29 | 730 (13.1%) | 341 (10.5%) | 51 (14.4%) | |
| 30 | 863 (15.5%) | 385 (11.8%) | 40 (11.3%) | |
| 31 | 584 (10.5%) | 321 (9.9%) | 49 (13.9%) | |
| ≥32 | 504 (9.0%) | 267 (8.2%) | 60 (17.0%) | |
| Birth weight (g) | ||||
| Mean (SD) | 1131 (366) | 1035 (332) | 1144 (338) | <0.001 |
| Median | 1110 | 1010 | 1188 | |
| Q1, Q3 | 849, 1389 | 760, 1280 | 866, 1381 | |
| Range | (310-2961) | (360-2480) | (380-2230) | |
| ≤500 | 82 (1.5%) | 65 (2.0%) | 5 (1.4%) | |
| 501-750 | 857 (15.4%) | 713 (21.9%) | 49 (13.9%) | |
| 751-900 | 742 (13.3%) | 521 (16.0%) | 47 (13.3%) | |
| 901-1000 | 527 (9.4%) | 301 (9.3%) | 21 (5.9%) | |
| 1001-1100 | 559 (10.0%) | 311 (9.6%) | 35 (9.9%) | |
| 1101-1250 | 757 (13.6%) | 452 (13.9%) | 46 (13.0%) | |
| ≥1251 | 2056 (36.8%) | 889 (27.3%) | 150 (42.5%) | |
| Sex | 0.001 | |||
| Female | 2604 (46.7%) | 1649 (50.7%) | 167 (47.3%) | |
| Male | 2976 (53.3%) | 1603 (49.3%) | 186 (52.7%) |
SD=Standard deviation, Q1=1st quartile, Q3=3rd quartile