Table 5.

 Relative excess risk due to interaction (RERI) between sex and perinatal variables with 95% CIs

RERI with sexa	RERI (95% CI)
Caesarean section × sex	0.013 (–0.17, 0.18)
Birthweight × sex	0.000 (–0.0001, 0.0001)
Gestational age (days) × sex	–0.002 (–0.02, 0.03)
Gestational lengtha × sex
Very preterm × sex	–0.17 (–0.62, 0.34)
Moderate to late preterm × sex	–0.04 (–0.35, 0.28)
Age of mother × sex	0.002 (–0.005, 0.008)
Birthweight z score × sex	0.006 (–0.05, 0.06)

^aGirls is the reference category