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 tercile | 35 (21–100) | 93 (89–98) | ||
HbF second tercile | 25 (21–38) | 0.053 | 95 (93–100) | 0.19 |
HbF first tercile | 21 (21–30) | 0.006 | 98 (93–99) | 0.02 |
34 weeks PMA | ||||
HbF lowest tercile | 30 (28–100) | 94 (89–99) | ||
HbF second tercile | 27 (21–48) | 0.11 | 95 (91–100) | 0.37 |
HbF first tercile | 21 (21–30) | 0.001 | 98 (94–100) | 0.006 |
37 weeks PMA | ||||
HbF lowest tercile | 35 (21–60) | 94.5 (92–100) | ||
HbF second tercile | 30 (21–35) | 0.39 | 95.5 (95–100) | 0.23 |
HbF first tercile | 21 (21–21) | 0.31 | 98 (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.