Table 1 Sociodemographic characteristics of pregnant women.
From: Association between ambient temperature and hypertensive disorders in pregnancy in China
Normotensive women | Gestational hypertension | Preeclampsia or Eclampsia | Chronic hypertension | Superimposed preeclampsia | |
|---|---|---|---|---|---|
n = 1,973,919 | n = 23,704 | n = 38,166 | n = 5453 | n = 1940 | |
Region | |||||
East | 585,971 (29.69%) | 8055 (33.98%) | 10,901 (28.56%) | 1938 (35.54%) | 549 (28.30%) |
Central | 783,049 (39.67%) | 9784 (41.28%) | 16,421 (43.03%) | 1919 (35.19%) | 857 (44.18%) |
West | 604,899 (30.64%) | 5865 (24.74%) | 10,844 (28.41%) | 1596 (29.27%) | 534 (27.53%) |
Hospital level | |||||
Unknown | 96,297 (4.88%) | 697 (2.94%) | 1774 (4.65%) | 309 (5.67%) | 60 (3.09%) |
Level 1 | 126,596 (6.41%) | 1116 (4.71%) | 1559 (4.08%) | 175 (3.21%) | 36 (1.86%) |
Level 2 | 883,819 (44.77%) | 9717 (40.99%) | 12,874 (33.73%) | 2041 (37.43%) | 436 (22.47%) |
Level 3 | 867,207 (43.93%) | 12,174 (51.36%) | 21,959 (57.54%) | 2928 (53.70%) | 1408 (72.58%) |
Antenatal care visits | |||||
None | 22,224 (1.13%) | 276 (1.16%) | 832 (2.18%) | 74 (1.36%) | 56 (2.89%) |
1–3 | 113,037 (5.73%) | 1502 (6.34%) | 2889 (7.57%) | 332 (6.09%) | 175 (9.02%) |
4–6 | 581,397 (29.45%) | 6171 (26.03%) | 11,946 (31.30%) | 1319 (24.19%) | 583 (30.05%) |
7–9 | 591,251 (29.95%) | 6966 (29.39%) | 11,282 (29.56%) | 1474 (27.03%) | 541 (27.89%) |
≥10 | 615,609 (31.19%) | 8078 (34.08%) | 9640 (25.26%) | 2066 (37.89%) | 445 (22.94%) |
Unknown | 50,401 (2.55%) | 711 (3.00%) | 1577 (4.13%) | 188 (3.45%) | 140 (7.22%) |
Mother’s education | |||||
College of higher | 760,655 (38.54%) | 9240 (38.98%) | 13,657 (35.78%) | 2406 (44.12%) | 671 (34.59%) |
High school | 554,642 (28.10%) | 6500 (27.42%) | 11,304 (29.62%) | 1390 (25.49%) | 579 (29.85%) |
Middle school | 563,258 (28.54%) | 6462 (27.26%) | 10,331 (27.07%) | 1289 (23.64%) | 495 (25.52%) |
Primary school | 45,958 (2.33%) | 824 (3.48%) | 1508 (3.95%) | 211 (3.87%) | 99 (5.10%) |
None | 8147 (0.41%) | 162 (0.68%) | 371 (0.97%) | 34 (0.62%) | 20 (1.03%) |
Unknown | 41,259 (2.09%) | 516 (2.18%) | 995 (2.61%) | 123 (2.26%) | 76 (3.92%) |
Marital status | |||||
Single/widower/divorced/cohabitation | 24,424 (1.24%) | 281 (1.19%) | 449 (1.18%) | 47 (0.86%) | 15 (0.77%) |
Married | 1,949,046 (98.74%) | 23,419 (98.80%) | 37,712 (98.81%) | 5405 (99.12%) | 1925 (99.23%) |
Unknown | 449 (0.02%) | 4 (0.02%) | 5 (0.01%) | 1 (0.02%) | |
Mother’s age | |||||
<20 | 38,179 (1.93%) | 359 (1.51%) | 610 (1.60%) | 55 (1.01%) | 12 (0.62%) |
20–24 | 313,318 (15.87%) | 2938 (12.39%) | 5118 (13.41%) | 446 (8.18%) | 125 (6.44%) |
25–34 | 1,338,331 (67.80%) | 15,064 (63.55%) | 23,648 (61.96%) | 3331 (61.09%) | 1033 (53.25%) |
35–39 | 170,312 (8.63%) | 3311 (13.97%) | 5546 (14.53%) | 1015 (18.61%) | 468 (24.12%) |
≥40 | 36,739 (1.86%) | 1222 (5.16%) | 1939 (5.08%) | 431 (7.90%) | 246 (12.68%) |
Unknown | 77,040 (3.90%) | 810 (3.42%) | 1305 (3.42%) | 175 (3.21%) | 56 (2.89%) |
Delivery method | |||||
Vaginal | 1,186,080 (60.09%) | 10,308 (43.49%) | 8365 (21.92%) | 1865 (34.20%) | 292 (15.05%) |
Cesarean section | 787,839 (39.91%) | 13,396 (56.51%) | 29,801 (78.08%) | 3588 (65.80%) | 1648 (84.95%) |
Fetus’s gender | |||||
Female | 949,029 (48.08%) | 11,564 (48.79%) | 19,112 (50.08%) | 2648 (48.56%) | 946 (48.76%) |
Male | 1,021,145 (51.73%) | 12,108(51.08%) | 18,827(49.33%) | 2787 (51.11%) | 964 (49.69%) |
Unknown | 3745 (0.19%) | 32 (0.13%) | 227 (0.59%) | 18 (0.33%) | 30 (1.55%) |
Parity | |||||
Nulliparous | 1,107,845 (56.12%) | 13,727 (57.91%) | 22,729 (59.55%) | 2868 (52.59%) | 815 (42.01%) |
1 | 745,118 (37.75%) | 8232 (34.73%) | 12,539 (32.85%) | 2141 (39.26%) | 895 (46.13%) |
2 | 101,917 (5.16%) | 1429 (6.03%) | 2338 (6.13%) | 363 (6.66%) | 166 (8.56%) |
≥3 | 18,680 (0.95%) | 311 (1.31%) | 546 (1.43%) | 80 (1.47%) | 62 (3.20%) |
Unknown | 359 (0.02%) | 5 (0.02%) | 14 (0.04%) | 1 (0.02%) | 2 (0.10%) |
Number of fetus | |||||
Single birth | 1,945,153 (98.54%) | 22,902 (96.62%) | 35,514 (93.05%) | 5253 (96.33%) | 1879 (96.86%) |
Polyembryony | 28,766 (1.46%) | 802 (3.38%) | 2652 (6.95%) | 200 (3.67%) | 61 (3.14%) |
Small for gestational age | |||||
No | 1,810,371 (91.71%) | 20,657 (87.15%) | 26,990 (70.72%) | 4610 (84.54%) | 1305 (67.27%) |
Yes | 156,765 (7.94%) | 2975 (12.55%) | 10,777 (28.24%) | 815 (14.95%) | 585 (30.15%) |
Unknown | 6783 (0.34%) | 72 (0.30%) | 399 (1.05%) | 28 (0.51%) | 50 (2.58%) |
Preterm | |||||
No | 1,844,447 (93.44%) | 21,523 (90.80%) | 25,069 (65.68%) | 4489 (82.32%) | 899 (46.34%) |
Yes | 129,472 (6.56%) | 2181 (9.20%) | 13,097 (34.32%) | 964 (17.68%) | 1041 (53.66%) |
Season of conception | |||||
Warm (Apr–Sep) | 832,708 (42.19%) | 10,823 (45.66%) | 17,094 (44.79%) | 2494 (45.74%) | 871 (44.90%) |
Cold (Oct–Mar) | 1,141,211 (57.81%) | 12,881 (54.34%) | 21,072 (55.21%) | 2959 (54.26%) | 1069 (55.10%) |
