A Propensity-score-based Fine Stratification Approach for Confounding Adjustment When Exposure Is Infrequent

This is the authors' abstract. We don't add key points for this paper.

For exposures with prevalence under 5%, propensity-score stratification with fine strata, based on the exposed group propensity-score distribution, produced the best results. For more common exposures, all approaches were equivalent.