Table 4

Levels of haemoglobin F and FiO2 and oxygenation saturation

FiO2 (%) median (range)P value
For FiO2
Reference (lowest tercile)
SpO2 (%) median (range)P value
For SpO2
Reference (lowest tercile)
31 weeks PMA
 HbF lowest tercile35 (21–100)93 (89–98)
 HbF second tercile25 (21–38)0.05395 (93–100)0.19
 HbF first tercile21 (21–30)0.00698 (93–99)0.02
34 weeks PMA
 HbF lowest tercile30 (28–100)94 (89–99)
 HbF second tercile27 (21–48)0.1195 (91–100)0.37
 HbF first tercile21 (21–30)0.00198 (94–100)0.006
37 weeks PMA
 HbF lowest tercile35 (21–60)94.5 (92–100)
 HbF second tercile30 (21–35)0.3995.5 (95–100)0.23
 HbF first tercile21 (21–21)0.3198 (97–100)0.12
 HbF second + first tercile
  • FiO2, fraction of inspired oxygen; HbA, adult haemoglobin; HbF, fetal haemoglobin; PMA, post-menstrual age; SpO2, oxygen saturation; wk, week.