Pearson's chi-square statistic was used for categorical variables and a t test for continuous measures. Some continuous variables were not normally distributed, and therefore the Wilcoxon rank-sum test was used. To evaluate univariate differences, we reported the percentage of responses using the chi-square test. Analyses were performed using the statistical package SPSS (Chicago, IL), and all significance tests were two-tailed.
Do you have any questions about this protocol?
Post your question to gather feedback from the community. We will also invite the authors of this article to respond.