Comparison of respiratory distress syndrome (RDS) and surfactant use in 1st and 2nd born twins from vaginal and caesarean section deliveries
| Outcome measure | Number of twin pairs | 2nd born twin only |
1st born twin only |
Odds ratio (95% CI) | p Value | p Value for interaction5-150 |
| RDS after vaginal delivery | 116 | 20 | 3 | 6.7 (2 to 35) | <0.001 | 0.13 |
| RDS after caesarean section | 136 | 21 | 12 | 1.8 (0.82 to 3.9) | 0.2 | |
| Surfactant use after vaginal delivery | 128 | 24 | 2 | 12 (3 to 104) | <0.001 | 0.08 |
| Surfactant use after caesarean section | 148 | 25 | 13 | 1.9 (0.92 to 4.1) | 0.07 |
↵5-150 p Value summarises the test of homogeneity of the odds ratios in the two groups.