Higher BP* (n=2619) | Lower BP (n=2288) | p Value† | |
---|---|---|---|
minMAP24 in mm Hg (mean, SD) | 30.87 (5.1) | 22.84 (3.9) | |
Gestational age in weeks (mean, SD) | 28.02 (2.29) | 28.10 (2.23) | 0.213 |
Birth weight in g (mean, SD) | 1013 (295) | 1015 (305) | 0.692 |
Gender, male (%) | 51.8 | 51.5 | 0.820 |
Small for gestational age (%) | 12.4 | 12.7 | 0.734 |
Multiples (%) | 31.4 | 34.9 | 0.01 |
Inborn (%) | 97.6 | 97.4 | 0.618 |
Mode of delivery (%) | |||
Elective caesarean section (%) | 77.4 | 77.4 | <0.001 |
Emergency caesarean section | 8.4 | 11.9 | |
Early-onset sepsis (%) | 1.5 | 1.8 | 0.476 |
Umbilical cord pH (mean, SD) | 7.32 (0.09) | 7.31 (0.10) | 0.73 |
5 min Apgar score <7 (%) | 16.0 | 20.8 | <0.001 |
Mechanical ventilation (%) | 48 | 61 | <0.001 |
p Values<0.05 are given in bold.
*The number of infants in the higher BP group is higher than the number of infants in the low BP group since higher BP was defined as BP ≥median BP of the according week of gestational age.
†Mann–Whitney U test for gestational age, birth weight and umbilical cord pH; χ2 test for all other variables.
BP, blood pressure; minMAP24, lowest mean arterial blood pressure during the first 24 h of life; VLBW, very-low birth weight.