Table 1.
Continuous Variables | Mean | SD | Minimum | Maximum |
---|---|---|---|---|
Birthweight (g) | 1,080.8 | 247.0 | 600 | 1,467 |
Gestational age (weeks) | 28.3 | 2.3 | 25 | 33 |
Apgar at 5 min | 7.4 | 1.3 | 4 | 9 |
Days on supplemental oxygen | 38.5 | 35.1 | 0 | 103 |
Days on mechanical ventilation | 15.4 | 18.0 | 0 | 61 |
Days in hospital | 71.6 | 27.6 | 30 | 128 |
Dichotomous variables | Negative history | Positive history | Comments | |
Retinopathy of prematurity | 10 | 20 | 4 missing data | |
Bronchopulmonary dysplasia | 19 | 15 | Diagnosed at 28 days | |
Intraventricular hemorrhage | 21 | 13 | 8 mild (grades 1–2); 5 severe (grades 3–4) | |
Periventricular leukomalacia | 32 | 2 |