胎龄 | 例数 | PDA发生率 |
<26周 | 1604 | 27.20% |
26~26 + 6周 | 1451 | 24.60% |
27~27 + 6周 | 666 | 11.30% |
28~28 + 6周 | 707 | 12.00% |
29~29 + 6周 | 595 | 10.10% |
30~30 + 6周 | 483 | 8.20% |
31~31 + 6周 | 389 | 6.60% |