Table 1 Demographic and menstruation-related characteristics of the participants (N = 291)
Variables | N | % | Mean | SD |
|---|---|---|---|---|
Age (years) | Â | Â | 16.35 | 1.53 |
School | Â | Â | Â | Â |
 Middle school students | 144 | 49.5 |  |  |
 High school students | 147 | 50.5 |  |  |
Body weight (kg) | Â | Â | 52.03 | 8.27 |
Height (cm) | Â | Â | 160.07 | 5.39 |
Body mass index | Â | Â | 20.25 | 2.61 |
 < 18.5 | 64 | 22.0 |  |  |
 18.5 to  < 25.0 | 195 | 67.0 |  |  |
 25.0 to < 30.0 | 11 | 3.8 |  |  |
 ≥ 30 | 2 | 0.7 |  |  |
 Missing | 19 | 6.5 |  |  |
Breakfast skipping | Â | Â | Â | Â |
 More than 4 days/week | 109 | 37.5 |  |  |
 Less than 3 days/week | 182 | 62.5 |  |  |
Age at menarche (years) | Â | Â | 13.30 | 1.07 |
Usual menstruation cycle length (days) | Â | Â | 32.08 | 14.14 |
Usual duration of menstruation (days) | Â | Â | 6.07 | 1.49 |
Menstrual pain intensity (possible range: 1–10) |  |  | 4.33 | 2.86 |
Experiences of visiting clinic for menstrual problems | Â | Â | Â | Â |
 Yes | 29 | 10.0 |  |  |
 No | 262 | 90.0 |  |  |