Table 2

Distribution of HbF, Hb and PaO2 during postnatal week 1 in relation to BPD

BPDUnadjustedAdjusted*Adjusted†
Postnatal week 1YesNoP valueOR by a 95% CIP valueOR by a 95% CIP valueOR by a 95% CI
HbFMean % (SD)61.8 (19.1)78.6 (14.7)<0.0010.55 (0.47 to 0.64)‡<0.0010.63 (0.52 to 0.77)‡<0.0010.64 (0.49 to 0.83)‡
HbMean g/L (SD)146.3 (8.6)153.7 (11.3)<0.0010.44 (0.34 to 0.57)‡0.0020.62 (0.46 to 0.84)‡<0.0010.36 (0.20 to 0.64)‡
PaO2Mean kPa (SD)7.4 (0.7)8.2 (1.3)<0.0010.47 (0.36 to 0.59)<0.0010.43 (0.30 to 0.60)0.0040.45 (0.26 to 0.77)
  • *Adjusted for gestational age at birth, birth weight small for gestational age, sex, highest and lowest FiO2 (12 hours).

  • †In the full statistical model, adjusted for gestational age at birth, birth weight small for gestational age, sex, highest and lowest FiO2 (12 hours) and CRIB-II score.

  • ‡OR by a 10-unit increase p values <0.05 in bold.

  • BPD, bronchopulmonary dysplasia; CRIB, Clinical Risk Index for Babies scoring system II; FiO2, fractional inspired oxygen; Hb, haemoglobin; HbF, fetal haemoglobin; PaO2, partial oxygen pressure.