Table 1.

Baseline characteristics

	Total cohort (N = 653)	Major bleed/death (n = 146)	No major bleed/death (n = 507)
Gestational age, median wk (IQR)*	26.7 (24.9-28.7)	27.0 (25.0-29.0)	26.0 (24.6-28.0)
Postnatal age, median d (IQR)†	7.5 (3.9-20.5)	8.7 (3.9-19.1)	7.0 (3.8-21.2)
Male, n (%)‡	394 (60.3)	88 (60.3)	306 (60.4)
Intrauterine growth retardation, n (%)	243 (37.2)	46 (31.5)	197 (38.9)
Antenatal corticosteroids, n (%)§	580 (88.8)	127 (87.0)	453 (89.3)
Sepsis, n (%)	412 (63.1)	102 (69.9)	310 (61.1)
Necrotizing enterocolitis, n (%)	107 (16.4)	31 (21.2)	76 (15.0)
Previous major bleeding, n (%)	120 (18.4)	38 (26.0)	82 (16.2)

IQR, interquartile range.

^*In 5 cases, the exact gestational age could not be determined because of uncontrolled pregnancies. It was estimated in full weeks.

^†Missing data in 2 cases, single imputation using the median.

^‡Missing data in 1 case, single imputation using the mode.

^§Missing data in 4 cases, single imputation using the mode.