Table 3.
Mortality and Morbidity in Mixed-Gender Twins: Comparison Between Male and Female Co-twins.
| Outcomes | The male twins (n, %) | The female twins (n, %) | OR (95%CI) | aOR (95%CI) |
|---|---|---|---|---|
| Fetal mortality | 1134 (1.05) | 1126 (1.04) | 1.01 (0.91, 1.13) | NA |
| Congenital abnormality | 1867 (1.75) | 1507 (1.41) | 1.38 (1.27, 1.50) | NA |
| Infant mortality | 2675 (2.52) | 2412 (2.27) | 1.30 (1.19, 1.42) | 1.43 (1.27, 1.61) |
| Neonatal mortality | 2152 (2.03) | 1964 (1.85) | 1.35(1.21, 1.51) | 1.59 (1.37, 1.85) |
| Infant mortality after 28 days | 523 (0.49) | 448 (0.42) | 1.17 (1.03, 1.34) | 1.18 (1.00, 1.40) |
| Low 5-minute Apgar score (<7) | 3612 (3.40) | 3428 (3.22) | 1.09 (1.00, 1.19) | 1.15 (1.05, 1.26) |
| Assistant ventilation >30 minutes | 4318 (4.06) | 3897 (3.67) | 1.42 (1.31, 1.54) | 1.31 (1.17, 1.47) |
| Respiratory distress syndrome | 3046 (5.30) | 2721 (4.73) | 1.52 (1.33, 1.72) | 1.45 (1.26, 1.66) |
OR: Odds Ratio; aOR: Odds Ratio adjusted by birth weight, birth order and methods of delivery.