| 年份 | 既往剖宫产史 [n (%)] | 宫腔 操作史 [n (%)] | 剖宫产 [n (%)] | 子宫破裂 [n (%)] | 前置胎盘 [n (%)] | 胎盘早剥 [n (%)] | 软产道 裂伤 [n (%)] | 宫缩乏力 [n (%)] | 胎盘植入 [n (%)] | 凝血功能障碍 [n (%)] |
| 2012 | 279 (11.73) | 1012 (42.50) | 992 (41.61) | 4 (0.22) | 39 (2.14) | 25 (1.37) | 84 (4.61) | 19 (1.04) | 109 (5.68) | 4 (0.22) |
| 2013 | 289 (11.78) | 983 (40.07) | 991 (40.40) | 1 (0.06) | 30 ( 1.94) | 31 (2.00) | 48 (3.10) | 23 (1.48) | 10 ( 0.65) | 0 (0.00) |
| 2014 | 449 (13.82) | 1343 (41.35) | 1321 (40.65) | 4 (0.14) | 80 (2.74) | 65 (2.23) | 135 (4.62) | 26 (0.89) | 159 (5.19) | 13 (0.45) |
| 2015 | 367 (19.53) | 878 (46.73) | 818 (43.53) | 7 (0.39) | 59 (3.3) | 44 (2.46) | 59 (3.30) | 38 (2.13) | 71 (3.85) | 9 (0.50) |
| 2016 | 523 (18.22) | 1162 (40.43) | 1118 (38.90) | 2 (0.07) | 75 (2.76) | 39 (1.44) | 170 (6.27) | 26 (0.96) | 29 (1.06) | 16 (0.59) |
| 2017 | 593 (21.85) | 1260 (46.43) | 1235 (45.50) | 6 (0.24) | 75 (3.00) | 40 (1.60) | 33 (1.32) | 30 (1.20) | 13 (0.52) | 5 (0.20) |
| 2018 | 572 (20.87) | 1221 (44.55) | 1277 (46.59) | 11 (0.44) | 89 (3.59) | 60 (2.42) | 18 (0.73) | 33 (1.33) | 7 (0.28) | 7 (0.28) |
| 2019 | 683 (19.58) | 1461 (41.87) | 1734 (49.70) | 11 (0.36) | 86 (2.78) | 63 (2.04) | 10 (0.32) | 74 (2.40) | 40 (1.28) | 8 (0.26) |
| 2020 | 589 (18.75) | 1327 (42.25) | 1642 (52.28) | 8 0.28) | 74 (2.61) | 48 (1.69) | 8 (0.28) | 113 (3.98) | 94 (3.23) | 6 (0.21) |
| 合计 | 4344 (17.43) | 10647 (42.72) | 11128 (44.65) | 54 (0.25) | 607 (2.80) | 415 (1.91) | 565 (2.60) | 382 (1.76) | 532 (2.41) | 68 (0.31) |
| χ2 | 141.095 | 1.920 | 149.654 | 4.140 | 2.847 | 0.046 | 229.938 | 61.701 | 83.383 | 0.264 |
| P | <0.001 | 0.165 | <0.001 | 0.042 | 0.092 | 0.829 | <0.001 | <0.001 | <0.001 | 0.607 |