2.4 Statistical Analysis
Descriptive weighted analyses were used to estimate the annual prevalence of anticholinergic medications among elderly dementia patients during the study period. The SAS SURVEYFREQ procedure was used to calculate annualized estimates using sampling weights. To examine factors associated with the use of anticholinergic medications,
multivariable logistic regression was conducted using PROC SURVEY LOGISTIC. The dependent variable was use of clinically significant anticholinergic agents, and
independent variables were various predisposing, enabling, and need factors. All the analyses were performed using SAS 9.3 with a statistical significance level of 0.05. (SAS Institute, Inc., Cary, NC, USA)