| 产前用药 | 非hsPDA组 | hsPDA组 | 总计 | χ2 | P |
| 糖皮质激素 | 2349 (65.76) | 4288 (72.74) | 6637 (70.11) | 51.681 | <0.001* |
| 硫酸镁 | 1749 (48.96) | 3307 (56.10) | 5056 (53.40) | 45.494 | <0.001* |
| 产前24小时内抗生素 | 1202 (33.65) | 1944 (32.98) | 3146 (33.23) | 0.455 | 0.500 |