Table 3. Risk reduction following introduction of prevention program. with and without logistic regression to adjust for gestational age (odds ratio <1 means reduced risk).
| Unadjusted | Adjusted for gestational age | |||
|---|---|---|---|---|
| Odds ratio (95% CI) | p-value | Odds ratio (95% CI) | p-value | |
| IVH (<1500g) | 0.43 (0.25 to 0.73) |
0.0018 | 0.49 (0.28 to 0.86) |
0.013 |
| IVH-free survival (<1500g) | 1.95 (1.20 to 3.15) |
0.0067 | 1.68 (1.01 to 2.81) |
0.047 |
| Grade III/IV IVH (<1500g) | 0.36 (0.14 to 0.89) |
0.028 | 0.45 (0.17 to 1.17) |
0.102 |
| IVH (<1000g) | 0.39 (0.20 to 0.74) |
0.004 | 0.47 (0.23 to 0.93) |
0.030 |
| IVH-free survival (<1000g) | 2.17 (1.20 to 3.92) |
0.01 | 1.78 (0.94 to 3.37) |
0.077 |
| Grade III/IV IVH (<1000g) | 0.48 (0.18 to 1.25) |
0.1331 | 0.61 (0.23 to 1.64) |
0.329 |
IVH: intraventricular hemorrhage; CI: confidence interval; p-value: significance level