Methods: In this single-blind trial 194 students with dysmenorrhea were
randomized to receive acupressure 5 days before menstruation for 3 months on either the Taichong or a
placebo point. The severity of dysmenorrhea was assessed in the first and last of the 4 study cycles using the
Andersch and Milsom scale. The χ2 test, t test, Mann-Whitney U test, and Wilcoxon signed rank test were
used for data analysis.