Table 3.
Outcome measures at the age of 4 months adjusted for infant age
| Umbilical cord clamping time (adjusted means (95% CI)) | P value | ||||
| 10 s (n=152 (HC)) |
60 s (n=147) |
180 s (n=148 (HC)) |
60 s vs 10 s | 60 s vs 180 s | |
| Main outcome measures | |||||
| Geometricmean (range) ferritin (μg/L) | 77 (68 to 87) | 103 (90 to 117) | 114 (100 to 129) | 0.002 | 0.29 |
| Haemoglobin (g/dL) | 11.3 (11.2 to 11.5) | 11.4 (11.3 to 11.6) | 11.3 (11.2 to 11.4) | 0.30 | 0.17 |
| Blood count | |||||
| Haematocrit (%) | 33.1 (32.7 to 33.4) | 33.1 (32.8 to 33.5) | 32.7 (32.4 to 33.1) | 0.30 | 0.12 |
| Mean cell volume (fL) | 77.8 (77.3 to 78.3) | 77.9 (77.3 to 78.4) | 79.1 (78.6 to 79.6) | 0.30 | 0.003 |
| Reticulocyte count (×1012/L) | 0.037 (0.035 to 0.039) | 0.037 (0.035 to 0.039) | 0.039 (0.038 to 0.041) | 0.99 | 0.07 |
| Iron status | |||||
| Transferrin receptor (mg/L) | 4.01 (3.87 to 4.14) | 4.05 (3.92 to 4.19) | 3.72 (3.59 to 3.85) | 0.62 | 0.001 |
| Transferrin saturation (%) | 15.7 (14.7 to 16.7) | 16.6 (15.5 to 17.7) | 18.1 (17 to 19.2) | 0.25 | 0.06 |
Values are means (95% CI) adjusted for infant age (days from birth) unless stated otherwise.
Successful analyses for the 60 s group: ferritin (n=147), haemoglobin (n=140), haematocrit, mean cell volume, reticulocyte count (n=135), transferrin receptor and transferrin saturation (n=145). For the 180 s group, blood status (n=144).
HC, historical cohort.