Statistical analysis
Mean ± standard deviation or median and interquartile range was used for
continuous variables. Categorical variables were summarized as
frequencies and percentages. Continuous variables were compared using
univariate analysis, and the chi-square test or Fisher exact test were
performed for categorical variables. Multivariate logistic regression
analysis was performed to find independent predictors of inappropriate
aspirin use. A p-value <0.05 was considered statistically
significant. Statistical analysis was performed using statistical
software (SPSS version 13.0, SPSS, Chicago, IL, USA).