Table 1.
Incidences of PIVH among infants with different birthweights
| birthweight (g) | n | PIVH (n) | incidence rate (%) |
|---|---|---|---|
| ≤1250 | 102 | 77 | 75.5 |
| ~1500 | 138 | 94 | 68.1 |
| ~2000 | 308 | 192 | 62.3 |
| ~2500 | 379 | 189 | 49.9 |
| >2500 | 195 | 67 | 34.4 |
χ2= 28.96, p<0.001
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