Table 1. Obstetric characteristics of the cohort.

Parameter	No IVH (n = 111)	With IVH (n = 118)	p-valuea
Gestational age [weeks]	26.6±2.1	26.3±2.0	0.19
Birth weight [g]	853±249	881±298	0.58
Sex [%Male]	43.2	56.4	0.06
Multiple birth [%, e.g. twins and triplets]	36.9	38.9	0.79
Normal vaginal delivery [%]	6.3	9.3	0.46
Rupture of the amniotic sac [%]	31.5	22.9	0.18

^ap-value based on the two-sided Wilcoxon rank-sum test for the null hypothesis that the group means for the two groups are equal.