Table 1. Demographic and Clinical Characteristics Used for Risk Estimates by Quartile of Baseline Risk for Grades 2 to 3 BPD or Death.
| Characteristic | Risk quartile | ||||
|---|---|---|---|---|---|
| 1 (18%-45%) (n = 199) | 2 (46%-53%) (n = 200) | 3 (54%-65%) (n = 200) | 4 (66%-84%) (n = 200) | All (N = 799) | |
| Gestational age, median (IQR), wk | 25 (24-26) | 25 (24-26) | 25 (24-26) | 25 (24-26) | 25 (24-26) |
| Birth weight, median (IQR), g | 800 (690-925) | 720 (618-790) | 667 (580-770) | 630 (530-710) | 690 (600-800) |
| Sex, No. (%) | |||||
| Boys | 58 (29.1) | 119 (59.5) | 121 (60.5) | 123 (61.5) | 421 (52.7) |
| Girls | 141 (70.9) | 81 (40.5) | 79 (39.5) | 77 (38.5) | 378 (47.3) |
| Highest Fio2 on day 14, median (IQR), % | 35 (30-44) | 40 (35-54) | 48 (38-60) | 60 (48-80) | 45 (35-60) |
| Respiratory support on postnatal day 14, No. (%) | |||||
| Conventional ventilation | 4 (2.0) | 13 (6.5) | 68 (34.0) | 165 (82.5) | 250 (31.3) |
| High-frequency ventilation | 193 (97.0) | 187 (93.5) | 132 (66.0) | 35 (17.5) | 547 (68.5) |
| Noninvasive positive pressure ventilation | 2 (1.0) | 0 | 0 | 0 | 2 (0.3) |
| Surgical NEC, No. (%) | 1 (0.5) | 7 (0.3) | 15 (7.5) | 17 (8.5) | 40 (5.0) |
Abbreviations: BPD, bronchopulmonary dysplasia; Fio2, fraction of inspired oxygen; NEC, necrotizing enterocolitis.