Table 2. Pre-randomization characteristics of the 78 women with primary dysmenorrhoea.
| Characteristic | Four-Agents-Decoction(n = 39) | Placebo (n = 39) |
| Age mean (SD*), years | 23.6 (2.97) | 23.3 (2.92) |
| College education, n (%) | 39 (100) | 39 (100) |
| Past user or believer, n (%) | 39 (79) | 39 (76) |
| Weight mean (SD), kg | 51.7 (5.71) | 52.0 (6.01) |
| Body-mass index mean (SD), kg/m2 | 19.8 (2.27) | 19.8 (1.75) |
| Menstruation duration mean (SD), days | 5.66 (0.98) | 5.77 (0.95) |
| Menstrual cycle length mean (SD), days | 27.2 (2.76) | 27.2 (3.52) |
*
SD, standard deviation