Correlations between pain levels and sleep for all participants (n=308)
| Outcome measure | Pain level (r value) | P value |
| Global PSQI score | 0.337 | <0.001 |
| C1: sleep quality | 0.316 | <0.001 |
| C2: sleep latency | 0.213 | <0.001 |
| C3: sleep duration | 0.143 | 0.012 |
| C4: sleep efficiency | 0.133 | 0.020 |
| C5: sleep disturbance | 0.330 | <0.001 |
| C6: sleep medication use | 0.171 | 0.003 |
| C7: daytime dysfunction | 0.196 | 0.001 |
| Sleep duration (hours) | −0.118 | 0.039 |
| Epworth Sleepiness Scale | 0.163 | 0.005 |
C, component; PSQI, Pittsburgh Sleep Quality Index.