Table 3

- Effects of chronic pain on depression and sleep quality dimensions (regression analyses).

Predictors	Depressed affect		Anhedonia		Somatic complaints		Interpersonal difficulties		Sleep efficiency		Perceived sleep quality
Predictors	B	β	B	β	B	β	B	β	B	β	B	β
Pain intensity	0.024	0.097	0.048^*	0.228^*	0.045^*	0.193^*	0.002	0.043	−0.032^*	−0.370^*	0.025	0.181
Pain disability	0.055^*	0.250^*	0.001	0.008	0.052^*	0.251^*	0.011^*	0.242^*	0.012	0.159	−0.028^*	−0.232^*
R² (explained variance)	10.9%		4.9%		17.3%		4.5%		7.4%		15%
F	14.0^*		5.96^*		24.06^*		5.42^*		9.21^*		20.27^*
β: unstandardized regression coefficient, B: standardized regression coefficient, F: test for linear regression, *P<0.05