Data analysis
Data were coded and entered into the Statistical Package for Social
Science (SPSS©) version 26 (IBM, Chicago, IL, US) by
the main researcher. Descriptive results are presented as proportions
(%) with 95% CIs, while logistic regression results are presented as
ORs with 95% CI. Statistical significance was considered at pvalue < 0.05 (with a confidence limit at 95%). Logistic
regression was used to assess predictors for inappropriate drugs-induced
QTcP prescriptions and examine predictors for major DDIs. To improve
reliability of regression, categorical variables of appropriate decision
(Completely appropriate, Inappropriate choice, and Incorrect
application) were combined and coded (No) against the variable
inappropriate decision which coded (Yes). Using the same approach,
moderate and minor DDIs were combined and coded (No) against major DDIs
which coded (Yes). Rao-Scott chi-square test which is a design-adjusted
version of the Pearson chi-square (36), was used to assess differences
between categorical variables.