Demographic and obstetric characteristics | 2013–2015 (n = 149,217) | 2016–2017 (n = 119,094) | χ2 | P |
---|---|---|---|---|
Age group (years) |  |  | 3927.778 |  < 0.01 |
 < 20 | 2265 (1.52) | 1310 (1.10) |  |  |
 20– | 34,289 (22.98) | 17,999 (15.11) |  |  |
 25– | 69,322 (46.46) | 54,919 (46.12) |  |  |
 30– | 31,442 (21.07) | 30,761 (25.83) |  |  |
 35– | 9704 (6.50) | 12,032 (10.10) |  |  |
 ≥ 40 | 2195 (1.47) | 2073 (1.74) |  |  |
Pregnancy complications |  |  | 1440.260 |  < 0.01 |
 Anemia | 22,412 (70.84) | 47,337 (79.35) |  |  |
 Diabetes | 3717 (11.75) | 6626 (11.11) |  |  |
 Nephropathy | 358 (1.13) | 401 (0.67) |  |  |
 Hepatopathy | 446 (1.41) | 693 (1.16) |  |  |
 Chronic hypertension | 780 (2.47) | 1186 (1.99) |  |  |
 Mild preeclampsia | 1116 (3.53) | 947 (1.59) |  |  |
 Severe preeclampsia | 2810 (8.88) | 2464 (4.13) |  |  |
Parity |  |  | 418.597 |  < 0.01 |
 < 1 | 83,318 (55.84) | 51,522 (43.26) |  |  |
 ≥ 1 | 65,899 (44.16) | 67,572 (56.74) |  |  |
History of cesarean section (Times) |  |  | 2905.329 |  < 0.01 |
 0 | 122,326 (81.98) | 87,390 (73.38) |  |  |
 ≥ 1 | 26,891 (18.02) | 31,794 (26.62) |  |  |
Frequency of pregnancy (Times) |  |  | 3557.308 |  < 0.01 |
 1 | 68,570 (45.95) | 41,158 (34.56) |  |  |
 > 1 | 80,647 (54.05) | 77,936 (65.44) |  |  |
Gestational weeks (weeks) |  |  | 59.211 |  < 0.01 |
 ≤ 27 | 3662 (2.45) | 3175 (2.67) |  |  |
 28– | 1871 (1.25) | 1560 (1.31) |  |  |
 33– | 6626 (4.44) | 5931 (4.98) |  |  |
 ≥ 37 | 137,058 (91.85) | 108,428 (91.04) |  |  |
Delivery mode |  |  | 31.385 |  < 0.01 |
 Vaginal delivery | 69,380 (46.50) | 56,665 (47.58) |  |  |
 Cesarean section | 76,863 (51.51) | 60,127 (50.49) |  |  |
 Abortion | 2974 (1.99) | 2302 (1.93) |  |  |
Education grade |  |  | 2619.692 |  < 0.01 |
 Primary school and below | 43,287 (29.01) | 45,150 (37.91) |  |  |
 Middle school | 46,503 (31.16) | 35,247 (29.60) |  |  |
 College and above | 59,427 (39.83) | 38,697 (32.49) |  |  |