TABLE 1

Comparison of Infants Followed Up and Lost to Follow-Up

CharacteristicsFollowed Up (n = 1472)Lost Follow-Up (n = 496)
Maternal age, y30 (26–34)27 (22–32)***
Aboriginal38 (2.6%)52 (10.5%)
Assisted conception213 (14.4%)34 (6.8%)
Multiple pregnancy392 (26.6%)114 (23%)
Pregnancy-induced hypertension26 (17.7%)50 (10.1%)***
Vaginal breech delivery149 (10%)41 (8.3%)
Caesarean delivery473 (32.1%)122 (24.6%)***
Outborn105 (7.1%)82 (16.5%)***
Gestational age, wk27 (26–28)27 (26–28)
Birth wt, g945 (776–1110)1024.5 (1185–1865.7)***
Birth wt <10th percentile152 (10.3%)26 (5.2%)***
Apgar <7 at 5 min281 (19.2%)86 (17.4%)
PDA treated647 (43.9%)190 (38.3%)*
NEC110 (7.5%)33 (6.7%)
CLD596 (40.5%)133 (26.8%)***
Postnatal steroid408 (27.7%)78 (11.7%)***
Home oxygen306 (20.8%)58 (11.7%)***
Systemic infection595 (40.4%)141 (28.4%)***
Any IVH429 (29%)120 (24%)*
IVH grade III or IV93 (6.3%)22 (4.4%)
IVH grade I or II336 (22.8%)98 (19.7%)
ROP grade ≥3187 (12.7%)36 (7.3%)***
Abnormal HUS at 6 wk120 (8.2%)21 (4.2%)**
  • Data are presented as median (interquartile range) or n (%). CLD, chronic lung disease defined as respiratory support at 36 weeks’ corrected age; HUS, head ultrasound; NEC, necrotizing enterocolitis; PDA, patent ductus arteriosus. *P < .05; **P < .01; ***P < .001.