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Covariate Means and Standard Deviations
| Covariate | Mean | Standard Deviation |
|---|---|---|
| Birth weight (grams) | 986.8 | 245.0 |
| Size at birth (wi/w̃) | 0.989 | 0.246 |
| Postmenstrual age (weeks) | 27.3 | 1.72 |
| Postnatal age (weeks) | 0.44 | 1.15 |
| Creatinine clearance (ml/min) | 0.69 | 0.34 |
