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Table 1 Demographic and sleep-related characteristics

From: Sarcopenia is associated with insomnia in Japanese older adults: a cross-sectional study of data from the Nagasaki Islands study

N

1592

Sex, Men, n (%)

575 (36.1)

Age, median (IQR)

74 (69–80)

BMI kg/m2, median (IQR)

22.7 (20.6–24.9)

 BMI ≤20 kg/m2, n (%)

319 (20.0)

 BMI 20–25 kg/m2, n (%)

894 (56.2)

 BMI > 25 kg/m2, n (%)

379 (23.8)

Habitual drinker, n (%)

38 (2.4)

Smoking status

 Never, n (%)

1117 (70.2)

 Past, n (%)

369 (23.2)

 Current, n (%)

106 (6.7)

Sleep duration

  < 6 h, n (%)

79 (5.0)

 6–7 h, n (%)

216 (13.6)

 7–8 h, n (%)

429 (27.0)

 8–9 h, n (%)

482 (30.3)

  ≥ 9 h, n (%)

385 (24.2)

Insomnia symptoms

 DIS, n (%)

432 (27.2)

 DMS, n (%)

592 (37.2)

 DIMS, n (%)

844 (53.0)

K6 global score ≥ 5, n (%)

134 (8.4)

  1. Abbreviations: BMI body mass index, DIS difficulty initiating sleep, DIMS difficulty initiating and/or maintaining sleep, DMS difficulty maintaining sleep, IQR interquartile range