Statistical analysis
All the statistical analyses were performed using the
SPSS statistical software (SPSS Inc., Chicago, USA). The
tablets were classified into 8 groups based on their
morphological features (color and logo). Kruskal-Wallis
test was used to compare the physicochemical
characteristics of tablets (weight, MDMA content, and
MDMA content to weight ratio) among different groups.
The correlation between two variables was analyzed by
using Spearman's rank correlation coefficient. P values less
than 0.05 were considered statistically significant