Table 1. Demographic characteristics and menstrual profile of the subjects (analysis of variance).

Variable	Ginger	Vitamin D	Vitamin E	Placebo	P-value
Age	22.8±1.8	22.7±1.5	22.3±1.4	22.3±1.6	0.586
BMI (kg/m2)	21.47±2.41	21.78±3.42	21.32±3.67	21.91±3.03	0.770
Menarche age (yr)	12.78±0.81	12.78±1.07	12.90±0.88	12.96±1.21	0.755
Duration of menstrual cycle (day)	25.35±1.12	25.26±1.15	25.32±1.09	25.26±1.02	0.969
Duration of menstruation (day)	5.14±0.83	5.08±0.92	5.32±1.26	5.26±0.72	0.582
Duration of dysmenorrhea (day)	2.60±0.75	2.52±0.81	2.76±1.07	2.60±0.90	0.596

Data are shown as mean±standard deviation.

BMI, body mass index.