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. 2020 Sep 25;12:755–763. doi: 10.2147/IJWH.S269392

Table 1.

Characteristics of the Study Participants (n = 879)

Characteristic
Age (years), mean (SD)
School year, number (%)
 First year
 Second year
 Third year
 Missing		 16.7 (0.9)

290 (33.0)
283 (32.2)
303 (34.5)
3 (0.3)
Age at menarche (years), mean (SD) 12.0 (1.4)
BMI (kg/m2), mean (SD) 19.6 (5.0)
Menstrual pain intensity, mean (SD) 4.6 (2.7)
Sleep-onset insomnia, n (%) 291 (33.1)
Total sleep duration (minutes), mean (SD) 368.7 (56.1)

Abbreviations: BMI, body mass index; SD, standard deviation.