Table 3 Demographic and clinical characteristics of infants at different times of umbilical cord clamping
Characteristic | ≤60s (n = 134) | 61–89 s (n = 106) | ≥90s (n = 105) | P |
|---|---|---|---|---|
Gender | 0.400 | |||
Male | 75 (55.9) | 62 (58.5) | 52 (49.5) | |
Female | 59 (44.1) | 44 (41.5) | 53 (50.5) | |
Length(cm) | 50.49 ± 2.15 | 50.59 ± 2.00 | 50.91 ± 2.02 | 0.210 |
Weight(g) | 3316.27 ± 356.70 | 3387.26 ± 379.20 | 3455.52 ± 363.78 | 0.037a |
Umbilical cord abscission | 12.00 (8.00, 15.75) | 10.00 (7.00, 15.00) | 9.00 (7.00, 13.00) | 0.008a |
Cord blood | ||||
Mass (g) | 32.00 (23.40, 43.82) | 32.00 (21.92, 41.42) | 34.20 (24.50, 45.60) | 0.330 |
Volume (ml) | 56.00 (46.00, 68.00) | 56.00 (46.00, 70.00) | 60.00 (48.00, 68.00) | 0.370 |
Total nucleated cells | 2.83 (1.45, 4.34) | 3.11 (1.81, 5.80) | 3.55 (2.00, 5.04) | 0.040 |
Placenta | ||||
Weight (g) | 536.32 ± 104.23 | 536.84 ± 106.55 | 555.15 ± 98.23 | 0.250 |
Volume (cm3) | 758.21 ± 156.00 | 746.72 ± 164.68 | 753.49 ± 154.49 | 0.890 |
Umbilical cord length (cm) | 60.28 ± 13.15 | 59.28 ± 9.05 | 58.62 ± 11.31 | 0.930 |
pH | 7.33 ± 0.07 | 7.30 ± 0.07 | 7.30 ± 0.06 | 0.010a |
pO2 | 27.80(21.93, 32.73) | 25.05(21.03, 29.88) | 27.00(20.43, 31.33) | 0.146 |
pCO2 | 42.31 ± 9.25 | 44.55 ± 9.46 | 44.20 ± 7.64 | 0.111 |
Apgar 1 minute | – | |||
10 | 134 (100%) | 106 (100%) | 105 (100%) | |
Apgar 5 minutes | – | |||
10 | 134 (100%) | 106 (100%) | 105 (100%) | |
Apgar 10 minutes | – | |||
10 | 134 (100%) | 106 (100%) | 105 (100%) | |
Symptomatic polycythemia | 0.210 | |||
Yes | 10 (7.5) | 3 (2.8) | 4 (3.8) | |
No | 124 (92.5) | 103 (97.2) | 101 (96.2) |