A prospective cohort study of psychiatric outpatients with a history of suicidal ideation was conducted, investigating the effect of alcohol consumption and incidence of attempted suicide over a follow-up period of 24 months. The data at the end of the follow-up period for males and females are given below.
Males
| Alcohol consumption | Cases | Participants |
| Light | 5 | 250 |
| Heavy | 23 | 375 |
Females
| Alcohol consumption | Cases | Participants |
| Light | 25 | 250 |
| Heavy | 52 | 167 |
Assume no loss to follow-up and that all participants were followed over the follow-up period.
Discuss statistical interaction and confounding by sex for the following effect measures
-Risk difference
-Risk ratio
-Odds ratio
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