Figure 2.

The frequency and quality of use of propensity score methods in studies investigating effectiveness of antimicrobial therapy. A, 2020 was not included in this figure, as we only included articles up to September 1, 2020. B, Distribution of propensity score methods used per year, median standardized quality scores per year in studies in which the effectiveness of antimicrobial therapy was investigated, and propensity score methods are applied. Abbreviation: SQSPM, Standardized Quality Score for Propensity score Methods.