Effect modification by infant sex in the associations of lockdown exposure with gestational length and PTB
Subgroup analyses showed similar associations of Level I lockdown with gestational length [adjusted β=-0.06 (95%CI: -0.08, -0.05) week vs adjusted β= -0.06 (-0.08, 0.05) week] or risk of PTB [adjusted OR=1.09 (95%CI: 1.04, 1.14) vs adjusted OR=1.08 (1.03, 1.13)] in male infants and in female infants (Table 4). There were no significant sex interaction (P>0.05) in these associations.