- Descriptive statistics for study variables (N=233).
| Measure | Mean | SD | Range | Skewness | Kurtosis |
|---|---|---|---|---|---|
| Pain intensity | 73.54 | 21.21 | 10-100 | -1.15 | 1.50 |
| Pain-related disability | 68.56 | 23.91 | 10-100 | -0.70 | 0.08 |
| Overall depression | 15.78 | 9.11 | 0-53.0 | 1.08 | 1.67 |
| Depression subscales | |||||
| Depressed affect | 3.30 | 5.25 | 0-21 | 1.66 | 1.83 |
| Anhedonia | 4.59 | 4.46 | 0-12 | 0.32 | −1.40 |
| Somatic complaints | 5.18 | 0-19 | 0-19 | 0.84 | −0.47 |
| Interpersonal difficulties | 0.42 | 1.10 | 0-6 | 3.10 | 9.98 |
| Overall poor sleep quality | 7.68 | 3.68 | 1-18.8 | 0.71 | 0.07 |
| Poor sleep quality subscales | |||||
| Sleep efficiency | 2.10 | 1.84 | 0-6 | 0.58 | −0.75 |
| Perceived sleep quality | 5.80 | 2.91 | 1-14 | 0.77 | 0.04 |