Table 3 Mortality and Morbidity in Mixed-Gender Twins: Comparison Between Male and Female Co-twins.

From: Gender Differences in Infant Mortality and Neonatal Morbidity in Mixed-Gender 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)
  1. OR: Odds Ratio; aOR: Odds Ratio adjusted by birth weight, birth order and methods of delivery.