Table 1:

Baseline characteristicsa

N = 140Missingb
Maternal characteristics
    Age (yr) (mean) (SD)30 (5.6)0
        Dutch74 (52.9%)
        Other Western9 (6.4%)
        Non-Western57 (40.7%)
Maternal smoking during pregnancy26 (18.6%)17
    IVF/ICSI9 (6.4%)0
    IUGR42 (30%)4
    PE/HELLP syndrome37 (26.4%)0
    Chorioamnionitis37 (26.4%)0
    PPROM32 (22.9%)0
Neonatal characteristics
    GA at birth (wk+ days)27+2 (26+1–28+1)0
    Male sex81 (57.9%)0
    BW (g)955 (780–1125)0
    Use of antenatal steroids127 (90.7%)2
    Apgar score at fifth minute8 (7–9)0
    CRIB score3 (1–6)1
    Death17 (12.1%)0
    Days on mechanical ventilation5 (1–14)3
    Days to regain birth weight9 (7–12)14
    Sepsis67 (47.9%)0
    IVH grade I or II32 (22.9%)0
    Severe BPD15 (10.7%)33
  • Note:—IVF/ICSI indicates in vitro fertilization with or without intracytoplasmic sperm injection; IUGR, intrauterine growth retardation; PE, pre-eclampsia; PPROM, prolonged premature rupture of membranes; CRIB, clinical risk index for babies; IVH, intraventricular hemorrhage; BPD, bronchopulmonary disease.

  • a Baseline data of maternal and neonatal characteristics are presented as median (interquartile range) or No. (%) unless otherwise specified.

  • b Missing data were mainly due to early transfer to a secondary hospital.

  • c Ethnicity was reported to provide insight in the generalizablity of the study population.