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Table 1 Characteristics of all preterm infants [mean ± SD or n(%)]

From: Postnatal growth of preterm infants during the first two years of life: catch-up growth accompanied by risk of overweight

Characteristics Total (n = 10,624)
Male, n (%) 5895 (55.5)
Primiparity, n (%) 5955 (56.1)
Gestational age, weeks 35.0 ± 1.8
Birth weight, g 2463 ± 520
Birth weight z-scorea 0.04 ± 0.91
Caesarean section, n (%) 6376 (60.0)
Maternal age, years 29.7 ± 4.9
Paternal age, years 31.7 ± 5.9
≥ college (maternal education) 6945 (76.6)
≥ college (paternal education) 7102 (78.3)
Subgroup by gestational age
  < 28 weeks, n (%) 40 (0.4)
 28 ~ 31+ 6 weeks, n (%) 642 (6.0)
 32 ~ 33+ 6 weeks, n (%) 1161 (10.9)
 34 ~ 36+ 6 weeks, n (%) 8781 (82.7)
Subgroup by birth weight
  < 1000 g, n (%) 35 (0.3)
 1000-1499 g, n (%) 437 (4.1)
 1500 ~ 2499 g, n (%) 4810 (45.3)
  > 2500 g, n (%) 5342 (50.3)
Intrauterine growth status
 SGA, n (%) 681 (6.4)
 AGA, n (%) 9141 (86.0)
 LGA, n (%) 802 (7.6)
  1. a Z-scores were computed according to the Fenton Preterm Infants Growth Charts;
  2. SD standard deviation; SGA small for gestational age; AGA appropriate for gestational age; LGA large for gestational age