Table 1.

Participants' demographic characteristics.

Characteristics	Mean ± SD	n (%)
Age (years)	20.78 ± 1.53
Age at menarche (years)	11.94 ± 0.91
Menstrual cycle (days)	30.97 ± 3.28
Menses duration (days)	6.28 ± 1.37
Past pain intensity	7.75 ± 1.53
Menstrual regularity
Yes		25 (78.1%)
No		7 (21.9%)
Initial onset of menstrual pain
Menarche		3 (9.4%)
<1 year after menarche		14 (43.8%)
1-2 years after menarche		9 (28.1%)
Others		6 (18.8%)
Time of dysmenorrhea
Day before menses		8 (25%)
First 2 days in menses		23 (71.9%)
Others		1 (3.1%)