Adjusted risk of mortality in group I compared with group II using regression model I with addition of antenatal antibiotics (AABX), antenatal steroids (ANS), and surfactant, separately and in combination, as covariates
| Model covariates | OR (95% CI) | p Value |
|---|---|---|
| Group I, birth from 1 January 1991 to 31 December 1994; group II, birth from 1 January 1995 to 31 December 1998. | ||
| Model I | 1.40 (1.2 to 1.7) | <0.0001 |
| +AABX | 1.20 (1.0 to 1.5) | 0.02 |
| +Surfactant | 1.30 (1.1 to 1.6) | 0.003 |
| +AABX+surfactant | 1.10 (0.95 to 1.4) | 0.17 |
| +ANS | 0.97 (0.79 to 1.2) | 0.75 |
| +ANS+AABX | 0.92 (0.75 to 1.1) | 0.43 |
| +ANS+surfactant | 0.91 (0.74 to 1.1) | 0.39 |
| + ANS+AABX +surfactant | 0.87 (0.70 to 1.1) | 0.18 |