Statistical analysis
Logistic regression and univariate analyses were performed to determine
the predictors of PIMs in our study population. The candidate predictors
included age, sex, number of comorbidities, number of prescribed
medications, and classes of healthcare facilities (first-tier,
second-tier or third-tier hospitals). Detailed information on the
classification of three-tiered healthcare system in China is provided in
the online
supplementary
appendix table 1. Statistical analyses were performed with the
application of SPSS Version 19.0 (Statistical Product and Service
Solutions) for Windows.