Table 2 Maternal and obstetric characteristics after propensity score matching
From: Clinical significance of true umbilical cord knot: a propensity score matching study
Parameter | N | Without TUCK (n = 7320) | With TUCK (n = 732) | P-value | Standardized difference |
|---|---|---|---|---|---|
Maternal age,years | 8052 | 32.47 ± 5.36 | 32.52 ± 5.14 | 0.71 | 0.006 |
Gestational age at delivery,weeks | 8052 | 39.0 (38.0–40.0] | 39.0 (38.0–40.0] | 0.40 | -0.005 |
Gravidity | 8052 | 3.0 [2.0–4.0] | 3.0 [2.0–4.0] | 0.02 | 0.03 |
Parity | 8052 | 1.0 [0.0–2.0] | 1.0 [1.0–2.0] | 0.09 | 0.02 |
Previous abortion | 8052 | 0.0 [0.0–1.0] | 0.0 [0.0–1.0] | 0.20 | 0.03 |
Assisted reproductive technology | 8052 | 249 (7.44) | 22 (6.52) | 0.16 | -0.03 |
BMI < 18.5 kg/m2 | 2703 | 161 (6.52) | 18 (7.62) | 0.68 | 0.04 |
≥ 18.5 and < 25 kg/m2 | 1446 (58.61) | 129 (54.66) | -0.08 | ||
≥ 25 and < 30 kg/m2 | 563 (22.82) | 56 (23.73) | 0.02 | ||
≥ 30 and < 35 kg/m2 | 198 (8.02) | 20 (8.47) | 0.01 | ||
≥ 35 kg/m2 | 99 (4.01) | 13 (5.5) | 0.07 | ||
Previous cesarean aection | 6466 | 767 (13.06) | 86 (14.47) | 0.33 | 0.04 |
Hypertensive disorder of pregnancy (any) | 8052 | 263 (3.59) | 27 (3.68) | 0.89 | 0.005 |
Chronic hypertension | 8052 | 39 (0.53) | 2 (0.27) | 0.58 | -0.04 |
Pre-eclampsia (any) | 8052 | 154 (2.10) | 15 (2.05) | 0.92 | -0.004 |
Mild pre-eclampsia | 8052 | 64 (0.87) | 4 (0.54) | 0.35 | -0.03 |
Severe pre-eclampsia | 8052 | 35 (0.47) | 2 (0.27) | 0.77 | -0.03 |
Pre-gestational diabetes | 8052 | 65 (0.88) | 4 (0.54) | 0.33 | -0.04 |
Gestational diabetes | 8052 | 538 (7.35) | 54 (7.37) | 0.97 | 0.001 |
Oligohydramnion | 8052 | 243 (3.32) | 22 (3.00) | 0.65 | -0.01 |
Polyhydramnion | 8052 | 105 (1.43) | 9 (1.23) | 0.65 | -0.01 |
Stillbirth history | 8052 | 83 (1.13) | 10 (1.36) | 0.58 | 0.02 |
Gender (male) | 8052 | 4311 (58.9) | 434 (59.29) | 0.58 | -0.008 |