The number of strata in propensity score stratification for a  binary outcome.

Conclusions: When applying a stratification, more than five strata may be preferable, especially because of increased power. Our simulation study does not show a clear winner; hence a useful strategy could be to work with five as well as with ten strata. PMID: 29765459 [PubMed]
Source: Archives of Medical Science - Category: General Medicine Tags: Arch Med Sci Source Type: research