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Table 1 Some population-level summaries commonly used in clinical trials with binary outcome measures

From: Planning a method for covariate adjustment in individually randomised trials: a practical guide

Outcome type

Summary measures

Collapsible?*

Continuous

Mean difference

Yes

Binary

Risk difference

Yes

 

Risk ratio

Yes

 

Odds ratio

No

Time-to-event

Hazard ratio

No

 

Restricted mean survival time difference

Yes

  1. *Do conditional and marginal summary measures always coincide?