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. Author manuscript; available in PMC: 2014 Jun 1.
Published in final edited form as: Pediatr Res. 2013 Sep 4;74(6):721–729. doi: 10.1038/pr.2013.162

Table 6.

Covariate Means and Standard Deviations

Covariate Mean Standard
Deviation
Birth weight (grams) 986.8 245.0
Size at birth (wi/) 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