Table 1

Characteristics participants "Project On Preterm and Small for gestational age infants" (POPS) followed up at the age of 19 year


total followed-up
Gestational age ≤ 32 weeks
Gestational age >32 weeks


n = 690
n = 508
n = 182
Gestational age (weeks), mean (range), SD
31 (26–41) ± 2.5
30 (26–32) ± 1.5
34 (32–41) ± 1.5
Birthweight (grams) mean (range), SD
1309 (560–2580) ± 293
1320 (560–2580) ± 325
1277 (600–1495) ± 175
male/female (%)
320/370 (46/54)
244/264 (48/52)
76/106 (42/58)
BPD (yes/no/unknown) (n)
58/505/127
55/362/91
3/143/36
duration mechanical ventilation (days) mean (range), SD
4.5 (0–55) ± 8.1
5.7 (0–55) ± 8.9
1.1 (0–41) ± 3.8

Vrijlandt et al. Respiratory Research 2005 6:117   doi:10.1186/1465-9921-6-117