Table 2 Descriptive statistics of the variables (n = 159)
Variables | Sum of score | Converted score | ||
|---|---|---|---|---|
Mean ± SD | Range | Mean ± SD | Range | |
Depression | 23.77 ± 5.31 | 0 ~ 60 | 1.19 ± 0.27 | 0 ~ 3 |
Sleep quality | 4.58 ± 3.22 | 0 ~ 15 |  |  |
 Sleep quality | 1.37 ± 0.80 | 0 ~ 3 |  |  |
 Sleep latency | 1.51 ± 1.04 | 0 ~ 3 |  |  |
 Sleep duration | 0.89 ± 0.99 | 0 ~ 3 |  |  |
 Habitual sleep efficiency | 0.47 ± 0.90 | 0 ~ 3 |  |  |
 Sleep disturbance | 1.32 ± 0.62 | 0 ~ 3 |  |  |
 Use of sleeping medication | 0.36 ± 0.89 | 0 ~ 3 |  |  |
 Daytime dysfunction | 1.43 ± 0.98 | 0 ~ 3 |  |  |