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Table 1 Conditional and marginal odds ratios

From: On the collapsibility of measures of effect in the counterfactual causal framework

  Counterfactual risk of outcome (placebo) Counterfactual risk of outcome (treatment) Causal odds ratio
Men (25%) 0.5 0.75 3
Women (75%) 0.25 0.5 3
Overall 0.3125 0.5625 2.83