Table 1 Clinical characteristics of pregnant women with IMH and euthyroid status
Characteristics | Euthyroid (n = 5714) | IMH (n = 1337) | χ2/Z value | P |
|---|---|---|---|---|
Maternal age (years) | 29(27–32) | 30(27–32) | -4.745 | < 0.001 |
Pregestational BMI (kg/m2) | 54.619 | < 0.001 | ||
< 18.5 | 1205(21.1) | 214(16.0) | ||
18.5–24.9 | 4162(72.8) | 973(72.8) | ||
≥ 25 | 347(6.1) | 150(11.2) | ||
Gravidity (%) | 31.629 | < 0.001 | ||
1 | 2139(37.4) | 428(32.0) | ||
2 | 2115(37.0) | 469(35.1) | ||
≥ 3 | 1460(25.6) | 440(32.9) | ||
Parity (%) | 7.785 | 0.005 | ||
Nullipara | 2909(50.9) | 624(46.7) | ||
Multipara | 2805(49.1) | 713(53.3) | ||
Education level (%) | 36.003 | < 0.001 | ||
Junior high school or lower | 853(14.9) | 259(19.4) | ||
High school | 2142(37.5) | 557(41.7) | ||
Bachelor or higher | 2719(47.6) | 521(39.0) | ||
History of chronic diseases (%) | 0.014 | 0.904 | ||
Yes | 320(5.6) | 76(5.7) | ||
No | 5397(94.4) | 1261(94.3) | ||
Gestational age (weeks) | 39.29(38.57–40.00) | 39.14(38.57–40.00) | -1.776 | 0.076 |
Delivery mode (%) | 11.997 | 0.002 | ||
Vaginal delivery | 3630(63.5) | 801(62.8) | ||
Caesarean section | 1907(33.4) | 507(37.9) | ||
Operative vaginal delivery | 177(3.1) | 29(2.2) | ||
Postpartum haemorrhage volume (mL) | 305(240–370) | 320(250–395) | -3.992 | < 0.001 |
Newborn weight (kg) | 3.20(2.90–3.40) | 3.20(2.95–3.75) | -4.430 | < 0.001 |
Newborn sex (%) | 0.908 | 0.341 | ||
Boy | 3063(53.6) | 736(55.0) | ||
Girl | 2651(46.4) | 601(45.0) |