Stratified analysis
Results of stratified analysis
were shown in Table S1-3 . The associations of history of
HA-treated IUAs with adverse
obstetric outcomes were generally
similar across different subgroups of maternal age (confidence intervals
of subgroups overlap) (Table S1 ). Similarly, mode of conception
(Table S2 ) and maternal parity (Table S3 ) also did not
modify the associations of history of HA-treated IUAs with adverse
obstetric outcomes