Table 1.
Demographics and Clinical Characteristics
| No BPD | Grade 1 BPD | Grade 2 BPD | Grade 3 BPD | Death prior to 36 weeks | p-value* | |
|---|---|---|---|---|---|---|
| N | 3257 | 2795 | 1526 | 551 | 1052 | |
| Birth weight, g, mean ± SD | 951 ± 173 | 838 ± 176 | 778 ± 173 | 752 ± 168 | 722 ± 161 | <0.0001 |
| Gestational age, weeks, mean ± SD | 26.7 ± 1.24 | 25.8 ± 1.49 | 25.5 ± 1.51 | 25.1 ± 1.52 | 24.7 ± 1.49 | <0.0001 |
| Male, n (%) | 1480 (45%) | 1420 (51%) | 896 (59%) | 315 (57%) | 613 (58%) | <0.0001 |
| Race | <0.0001 | |||||
| Black, n (%) | 1576 (50%) | 973 (36%) | 511 (35%) | 237 (44%) | 415 (41%) | |
| White, n (%) | 1399 (44%) | 1531 (57%) | 870 (59%) | 267 (50%) | 533 (52%) | |
| Other, n (%) | 198 (6%) | 196 (7%) | 100 (7%) | 32 (6%) | 73 (7%) | |
| Hispanic ethnicity, n (%) | 447 (14%) | 439 (16%) | 228 (15%) | 48 (9%) | 142 (14%) | 0.0004 |
| Patent ductus arteriosus, n (%) | 971 (30%) | 1445 (52%) | 950 (62%) | 356 (65%) | 419 (40%) | <0.0001 |
| Sepsis, n (%) | 378 (12%) | 624 (22%) | 444 (29%) | 253 (46%) | 339 (41%) | <0.0001 |
| Surgical necrotizing enterocolitis, n (%) | 46 (1%) | 61 (2%) | 51 (3%) | 63 (11%) | 156 (15%) | <0.0001 |
| Antenatal corticosteroids, n (%) | 2990 (92%) | 2543 (91%) | 1379 (90%) | 515 (93%) | 904 (86%) | <0.0001 |
Definition of abbreviations: BPD = bronchopulmonary dysplasia; SD = standard deviation