Table 3. 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