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Table 6 Mean weight gain from 1 week after birth to 34 weeks of 4 NICHD cohorts and the 3 PreM Growth Study cohorts

From: Validating the weight gain of preterm infants between the reference growth curve of the fetus and the term infant

NICHD cohorts 688 g* 950 g 1150 g
N 197 191 168
Gestational age (mean) 25.4 27.6 29.0
Small for gestational age (%) 45.4 18.5 22.8
Weight gain (g/kg/d) 14.0 14.6 16.0
Regain birthweight (days) 16.6 +/− 12.3*** 14.4 +/− 9.7*** 13.2 +/− 8.5***
PreM Growth study cohorts 664 g 992 g 1084 g
N 193 429 160
Gestational age (mean) 24.4 27.0 29.6
Small for gestational age (%) 1.3 8.0 26.2
Weight gain (g/kg/d) ** 13.1 15.2 14.8
Regain birthweight (days) 12.2 +/− 5.9*** 12.4 +/− 5.1*** 10.1 +/− 4.1***
  1. * Weighted average of the NICHD 550 and 750 gram groups.
  2. ** Weight gain was calculated from when birthweight was regained to 2 kilograms.
  3. *** p < 0.001.