Baseline characteristics of mothers and infants according to time for umbilical cord clamping
| Umbilical cord clamping time | P value | |||
| 10 s (n=166 (HC)) | 60 s (n=191) | 180 s (n=168 (HC)) | ||
| Maternal characteristics | ||||
| Age (years) | 31.7 (4.2) | 30.7 (4.7) | 30.8 (4.9) | NS |
| Parity (including study child) | 1.81 (0.87) | 1.86 (0.76) | 1.76 (0.74) | NS |
| Weight at first antenatal visit (kg) | 66.4 (12.0) | 67.3 (11.5) | 67.3 (12.1) | NS |
| Body mass index | 23.6 (3.8) | 24.5 (3.9) | 23.9 (3.6) | NS |
| Haemoglobin at first antenatal visit (g/dL) | 12.8 (9) | 12.8 (10) | 12.8 (11) | NS |
| Number (%) of vaginal deliveries | ||||
| Non-instrumental | 157 (95) | 184 (96) | 157 (94) | NS |
| Vacuum extraction | 8 (5) | 7 (4) | 11 (7) | NS |
| Forceps | 1 (0.6) | 0 (0) | 0 (0) | NS |
| Infant characteristics | ||||
| Gestational age (weeks) | 40.0 (1.1) | 40.0 (1.0) | 40.0 (1.1) | NS |
| Number (%) of males | 83 (50) | 98 (51) | 73 (43) | NS |
| Birth weight (g) | 3523 (483) | 3603 (454) | 3633 (464) | NS |
| Birth length (cm) | 50.7 (1.9) | 50.6 (1.8) | 50.9 (1.9) | NS |
| Head circumference (cm) | 34.7 (1.3) | 35.1 (1.3) | 35.0 (1.4) | NS |
| Umbilical cord haemoglobin (g/L) | 163 (15) | 153 (20) | 158 (18) | <0.001* |
| Umbilical cord haematocrit (%) | 48.7 (4.3) | 47.0 (5.5) | 47.1 (5.0) | 0.005** |
Values are means (SD) unless stated otherwise. P<0.05 was considered significant.
*Comparison of 10 and 60 s. For 180 and 60 s, P=0.063.
**Comparison of 10 and 60 s. For 180 and 60 s, P>0.99.
HC, historical cohort; NS, non-significant.