There was an interaction with deprivation , OR = 1.11 , 95 % CI [ 1.04 , 1.18 ] , but the positive effect observed in the lowest socioeconomic status ( SES ) tertile was small ( 35.2 % vs. 33.0 % ) , OR = 1.103 , 95 % CI [ 1.01 , 1.21 ] , and offset by a negative effect in the least deprived tertile ( 45.6 % vs. 48.2 % ) , OR = 0.90 , 95 % CI [ 0.82 , 0.99 ] .