Table 2. Outcomes by lowest haemoglobin (Hb) at 20 weeks gestation or less.
| Total | Lowest Hb in first 20 wks | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| <110 g/L | 110–139 g/L | 140+ g/L | χ2 | ||||||
| n = 31,906 | n = 1282 | n = 27,356 | n = 3268 | test | |||||
| Col % (n) | Col % (n) | Col % (n) | Col % (n) | ||||||
| Adverse maternal outcomes | |||||||||
| Postpartum haemorrhage | 13.6% | (4355) | 15.5% | (199) | 13.4% | (3674) | 14.7% | (482) | * |
| Transfusion | 2.1% | (659) | 4.9% | (63) | 2.0% | (542) | 1.7% | (54) | *** |
| Preterm birth (<37 wks) | 7.1% | (2281) | 10.8% | (138) | 6.8% | (1848) | 9.0% | (295) | *** |
| Planned preterm | 3.7% | (1165) | 6.7% | (86) | 3.4% | (936) | 4.4% | (143) | |
| Spontaneous preterm | 3.5% | (1116) | 4.1% | (52) | 3.3% | (912) | 4.7% | (152) | |
| Adverse neonatal outcomes | |||||||||
| Stillbirth | 0.7% | (235) | 2.0% | (25) | 0.7% | (186) | 0.7% | (24) | *** |
| Small for gestational age | 9.5% | (3031) | 12.1% | (155) | 9.4% | (2582) | 9.0% | (294) | ** |
| Very low birthweight (<1500g) | 2.0% | (638) | 3.7% | (47) | 1.9% | (512) | 2.4% | (79) | *** |
| Transfer to NICU/SCN | 16.0% | (5112) | 19.7% | (253) | 15.6% | (4272) | 18.0% | (587) | *** |
χ2 test significance:
*p<0.05
**p<0.01
***p<0.001