Table 1.
Initial state variables
| wrap group | control group | |
|---|---|---|
| Lost to follow-up‡ | 70/183 (38.3%) | 46/173 (26.6%) |
| Gestational age in weeks (median & range) |
25.4 (22–27) n = 113 |
25.9 (22–27) n = 127 |
| Waiver of consent | 32/113 (28.3%) | 30/126* (23.8%) |
| Infant female | 52/112* (46.4%) | 59/125* (47.2%) |
| Birth weight in grams (median & range) |
720 (340–1307) n = 111* |
790 (370–1595) n = 125* |
| Intrauterine growth restriction | 7/111* (6.3%) | 4/125* (3.2%) |
| Antenatal corticosteroid use | 105/110* (95.5%) | 113/125* (90.4%) |
| Chorioamnionitis | 32/110* (29.1%) | 24/122* (19.7%) |
| Sepsis in baby | 49/105* (46.7%) | 59/115* (51.3%) |
| Necrotizing enterocolitis (≥ stage 2) | 11/105* (10.5%) | 9/109* (7.6%) |
| Bronchopulmonary dysplasia treated with steroids | 105/110* (95.5%) | 113/125* (90.4%) |
| Mother’s education (high school diploma or less) | 60/112* (53.6%) | 72/125* (57.6%) |
|
Maternal temperature in labour degrees C (median & range) |
36.9 (35.6–39.7) n = 101* |
36.8 (35.6–38.9) n = 101* |
| Newborn temperature after admission to NICU in degrees C (median & range)† |
36.3 (33.6–38.4) n = 104* |
35.9 (32.1–37.7) n = 117* |
|
Age (minutes) left delivery room (median & range) |
15 (4–130) n = 71* |
15 (5–45) n = 65* |
|
Age in days to final extubation (median & range)† |
42 (1–109) n = 109* |
24 (1–143) n = 88* |
| Intraventricular hemorrhage grades III or IV | 14/98* (14.3%) | 18/115* (15.7%) |
| Cystic periventricular leukomalacia | 3/97* (3.1%) | 6/115* (5.2%) |
| Pulmonary hemorrhage | 9/109* (8.3%) | 17/124* (13.7%) |
‡loss to follow-up is significantly higher in the wrap group p < 0.025 (Fisher’s exact test)
*do not add up to 113 for the wrap group and 127 for the control group due to missing data
†p < 0.05 (Fisher exact test)