2.5 Statistical analysis
The reliability and validity of the Turkish HPMDQ were measured using
internal consistency and test–retest statistical tools. To calculate
the overlap in the HPMDQ response scores of the same people at different
time points (i.e., initially and one month later), the intraclass
correlation coefficient (ICC) was calculated for the aggregate scoring
and the weighted Cohen’s kappa was calculated for the scoring of each
item. Concurrent validity was evaluated using correlation with outer
criteria (IPSS). Correlation coefficients of 0.1 weak, 0.3 medium and
0.5 strong were used, as proposed by Cohen.
Statistical analysis was completed using the IBM Statistical Package for
the Social Sciences, version 22.0 (IBM SPSS
Statistics]). The level of
significance was set at p < 0.05, internal consistency
reliability was evaluated using Cronbach’s alpha, and test–retest
reliability was assessed using the Wilcoxon signed-rank test. Spearman
correlation analysis was used for simultaneous external validity.
Consistency and reliability are assumed sufficient for values
>0.70.