Table 4 Comparison of birth outcomes between the sex-discordant and sex-concordant twins (combined pre-pandemic and cohorts)

Median gestational age in wk, days^a

36⁺⁰

36⁺⁶

 < 0.0001

Birthweight in g, mean (SD)

2202.7 (673.6)

2352.0 (640.7)

 < 0.0001

All-cause stillbirths, n (%)

60 (1.9)

17 (1.2)

0.11

Preterm birth 37 wk, n (%)

2309 (73.1)

779 (56.7)

 < 0.001

Iatrogenic birth for suspected fetal compromise, n (%)

613 (19.4)

217 (15.8)

 < 0.001