There was an interaction with deprivation , OR = @ , @ % CI -LSB- @ , @ -RSB- , but the positive effect observed in the lowest socioeconomic status ( SES ) tertile was small ( @ % vs. @ % ) , OR = @ , @ % CI -LSB- @ , @ -RSB- , and offset by a negative effect in the least deprived tertile ( @ % vs. @ % ) , OR = @ , @ % CI -LSB- @ , @ -RSB- .