| | Characteristic | PT children | FT children | Group differences | | (n= 110) | (n= 39) |
| | Gender | | | | | Male, n (%) | 63 (57%) | 21 (54%) | ns | | Female, n (%) | 47 (43%) | 18 (46%) | | | Gestational age (weeks) | | | | | M (SD), range | 31.16 (2.63), 24–34 | 39.82 (0.97), 37–41 | PT < FT | | ≤ 28, n (%) | 19 (17%) | | | | 29-32, n (%) | 34 (31%) | | | | 33-34, n (%) | 57 (52%) | | | | Birthweight (grams) | | | | | M (SD), range | 1556.02 (480.98), 490–2400 | 3372.56 (345.89), 2500–4258 | PT < FT | | 1 min. Apgar score | | | | | M (SD), range | 7.65 (1.89), 1–9 | 8.95 (0.32), 7–9 | PT < FT | | 5 min. Apgar score | | | | | M (SD), range | 8.9 (1.3), 2–10 | 9.9 (0.31), 9–10 | PT < FT | | Ventilation duration (days) | | | | | M (SD), range | 17.02 (34.85), 0–205 | -- | | | Hospitalization duration | | | | | M (SD), range | 44.32 (36.70), 9–205 | 2.95 (0.89), 2–5 | PT > FT | | Maternal age at birth (years) | | | | | M (SD), range | 31.54 (5.86), 19–51 | 33.03 (4.18), 27–41 | ns | | Maternal education (years) | | | | | High-school education n (%) | 21 (19%) | 4 (10%) | | | Non-academic professional | 19 (17%) | 4 (10%) | | | education n (%) | 46 (42%) | 22 (57%) | ns | | Undergraduate degree n (%) | 24 (22%) | 9 (23%) | | Master’s and/or doctoral | | | | | degree n (%) | | | | | Income | | | | | Below median n (%) | 23 (21%) | 3 (8%) | | | Median range n (%) | 71 (64%) | 28 (72%) | ns | | Above median n (%) | 16 (15%) | 8 (20%) | |
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