The possibility that the apparent direction of an association will be reversed when covariates are taken into account is well known, but many examples of this effect are rather contrived. A real example from an epidemiological survey is presented.
No takes yet. Share an insight, caveat, or question.
Appleton et al. (1996) studied this question.
Synapse has enriched 3 closely related papers on similar clinical questions. Consider them for comparative context: