Lowest BP on day one <25th percentile* N=1064 (%) | Lowest BP on day one 25–49th percentile N=1224 (%) | Lowest BP on day one 50–75th percentile N=1520 (%) | Lowest BP on day one >75th percentile N=1099 (%) | |
---|---|---|---|---|
IVH | 24.0 | 17.1 | 17.1 | 14.2 |
BPD | 21.3 | 17.4 | 16.2 | 13.6 |
Death | 6.3 | 4.3 | 3.6 | 2.1 |
*BP below the 25th percentile, which can be calculated by (gestational age in weeks—5=BP in mm Hg), had worst outcome for IVH, BPD and death if compared with infants with BP above this threshold. p<0.001 for all endpoints, χ2 test. Results were confirmed by multivariate logistic regression (table 5).
BP, blood pressure; BPD, bronchopulmonary dysplasia; IVH, intraventricular haemorrhage.