FIGURE 2.

Standardized mean differences of covariates before and after propensity matching. The dashed vertical line denotes a standardized mean difference of 0.1. The standardized mean differences in the unmatched sample were ≥0.1 in eight of the 17 covariates (47.1%). After propensity matching, all standardized mean differences were <0.1, indicating that the baseline demographics and comorbidities were well balanced between the antiplatelet and non‐antiplatelet groups. Abbreviations: BMI, body mass index; COPD, chronic obstructive pulmonary disease