Table 2 Factor loadings by exploratory factor analysis and internal reliability of the simplified Chinese NRSS (n = 275)
Factor loadings | Internal reliability | ||||
|---|---|---|---|---|---|
Item | F1 | F2 | F3 | F4 | Corrected Item-total correlation (subscales) |
Q1:…rate the quality of your sleep | 0.84 | 0.62 (0.68) | |||
Q2:…sleep is restoring or refreshing? | 0.70 | 0.52 (0.60) | |||
Q3:…felt rested if you’ve slept for your usual amount of time? | 0.43 | 0.49 (0.54) | |||
Q4:…had physical sensations or unusual feelings? | 0.61 | 0.39 (0.52) | |||
Q5:…one or more of the following: headaches, body pain, numbness or tingling…? | 0.52 | 0.48 (0.52) | |||
Q6: physical or medical problems are dragging you down? | 0.87 | 0.62 (0.68) | |||
Q7:… have a sense of panic, or physical symptoms of panic…? | 0.67 | 0.46 (0.58) | |||
Q8:…memory and concentration…? | 0.78 | 0.55 (0.73) | |||
Q9:…level of daytime energy? | 0.83 | 0.59 (0.78) | |||
Q10:…alert during the daytime? | 0.85 | 0.60 (0.74) | |||
Q11:…depressed or down if you didn’t sleep well…? | 0.48 | 0.29 (0.39) | |||
Q12:…irritable or gotten the blahs” if you didn’t sleep well. | 0.88 | 0.44 (0.39) | |||