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Table 2 Neonatal, feeding and discharge characteristics of the PreM Growth Study cohorts gestational age categories*

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

Characteristic 23 to 25 weeks 26 to 28 weeks 29 to 31 weeks
N 227 539 213
Birthweight (grams) 715 (124) 997 (194) 1071 (169)
Gestational age (weeks) 24.4 (0.7) 27.1 (0.8) 29.7 (0.8)
Male sex (%) 51.5 51.8 55.2
Necrotizing enterocolitis** (%) 6.1 6.0 4.4
Supplemental O2 (days) 92 +/− 36 56 +/− 35 24 +/− 16
On oxygen at 28 days (%) 97.2 78.5 34.7
On oxygen at 36 weeks (%) 66.2 42.8 18.5
Feeding :    
Parenteral nutrition start (day) 0.4 (0.7) 0.4 (0.6) 0.4 (0.7)
Minimal enteral feed start (day) 7.4 (5.9) 4.4 (3.7) 2.7 (3.1)
Enteral feeds start (day) 16.7 (9.4) 9.8 (6.9) 6.6 (5.3)
Full feeds (day) 34 (15) 22 (10) 17 (9.4)
Predominant EN feedings:    
Fortified breastmilk (%) 77.4 77.9 80.4
Non-fortified breastmilk (%) 1.9 2.6 7.6
Preterm formula (%) 15.7 13.3 8.7
Post D/C breastmilk (%) 50.4 52.3 67.2
  1. * mean (SD).
  2. ** stage II or III NEC as defined by modified Bell’s criteria [23].