The RU_SATED as a measure of sleep health: cross-cultural adaptation and validation in Chinese healthcare students

Table 4 Internal consistency and test–retest reliability for the RU_SATED-C at T1 and T2 (N = 898)

	Total/items	SEM
	Total/items	T1	T2
Ordinal Cronbach's Alpha
T1	0.670 (0.637, 0.704)
T2	0.722 (0.693, 0.750)
Ordinal McDonald's Omega
T1	0.676 (0.643, 0.708)
T2	0.725 (0.698, 0.753)
ICC (T1, T2)	0.683 (0.646, 0.716)	1.216	1.259
01. Do you go to bed and get out of bed at about the same time (within one hour) every day?	0.464 (0.411, 0.514)	0.403	0.406
02. Are you satisfied with your sleep?	0.621 (0.579, 0.660)	0.406	0.398
03. Do you stay awake all day without dozing?	0.561 (0.513, 0.604)	0.404	0.411
04. Is the middle of your sleep between 2:00 a.m. and 4:00 a.m.?	0.616 (0.574, 0.655)	0.506	0.476
05. Do you spend less than 30 min awake at night? This includes the time it takes to fall asleep plus awakenings during sleep.	0.354 (0.296, 0.410)	0.597	0.593
06. Do you sleep between 6 and 8 h per day?	0.531 (0.482, 0.576)	0.318	0.331

Point estimate and 95% confidence interval; Estimates on Cronbach's Alpha and McDonald's Omega assuming ordinal level; T1, Time 1; T2, Time 2; ICC, intraclass correlation efficient; SEM, standard error of measurement; SEM = SD × sqrt (1-ICC); SD, standard deviation

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