Table 1. The numbers of women with multiple gestation pregnancy and pregnancy complications at each of the ten hospitals.
| Hospitals | No. Multiples births (%) | No. Twin births (%)* | No. pregnancy complications (%)† |
|---|---|---|---|
| First Affiliated Hospital of Chongqing Medical University | 180 (5.5) | 177 (98.3) | 71 (39.4) |
| First Affiliated Hospital of Sun Yat-sen University | 206 (6.3) | 200 (97.1) | 131 (63.6) |
| Gulou Clinical Medical College of Nanjing Medical University | 159 (4.9) | 157 (98.7) | 81 (50.9) |
| Obstetrical and Gynecological Hospital affiliated Fudan University | 468 (14.4) | 461 (98.5) | 180 (38.5) |
| Peking University First Hospital | 156 (4.8) | 149 (95.5) | 77(49.4) |
| Shandong Provincial Hospital to Shandong University | 334 (10.0) | 275 (82.3) | 131 (39.2) |
| Shanghai First Maternity and Infant Health Institute Affiliated Tongji University | 409 (12.6) | 408 (99.8) | 25 (6.1) |
| Shengjing Hospital of China Medical University | 430 (13.2) | 393 (91.4) | 221 (51.4) |
| Third Hospital affiliated GuangZhou Medical University | 366 (11.3) | 353 (96.4) | 179 (48.9) |
| Women's Hospital School of Medicine Zhejiang University | 538 (16.6) | 528 (98.1) | 457 (84.9) |
| Overall | 3246 | 3101 (95.5) | 1553 (47.8) |
*
The proportions of twin births were calculated as the proportion of all multiples births at each hospital.
†
The proportions of pregnancy complications were calculated as the proportion of all multiples births at each hospital. Pregnancy complications included gestational hypertension, gestational diabetes mellitus, preterm birth, and pregnancy complicated with internal medicine, surgical, or infectious disease.