The association of sleep difficulties with health-related quality of life among patients with fibromyalgia

Table 4 Regression estimates for the number of sleep difficulty symptoms when predicting health-related quality of life

Dependent variable		No symptoms (reference)	One symptom	Two or more symptoms
Mental component summary	b	--	−2.786	−3.905
	95% CL	--	(−4.448, -1.124)	(−5.461, -2.35)
	R²		0.174
Physical component summary	b	--	−2.415	−2.835
	95% CL	--	(−4.144, -0.686)	(−4.467, -1.202)
	R²		0.241
Health utilities	b	--	−0.041	−0.054
	95% CL	--	(−0.06, -0.022)	(−0.072, -0.035)
	R²		0.284
Bodily pain	b	--	−5.770	−8.555
	95% CL	--	(−9.729, -1.811)	(−12.239, -4.87)
	R²		0.312
General health	b	--	−6.349	−8.441
	95% CL	--	(−10.358, -2.34)	(−12.222, -4.66)
Vitality	R²		0.153
	b	--	−5.943	−6.637
	95% CL	--	(−9.994, -1.893)	(−10.447, -2.827)
	R²		0.097
Social functioning	b	--	−7.327	−10.838
	95% CL	--	(−11.741, -2.913)	(−14.906, -6.771)
	R²		0.205
Mental health	b	--	−4.366	−8.658
	95% CL	--	(−7.71, -1.021)	(−11.805, -5.511)
	R²		0.184
Emotional role limitations	b	--	−8.094	−7.546
	95% CL	--	(−12.802, -3.387)	(−11.847, -3.245)
	R²		0.120
Physical role limitations	b	--	−9.485	−10.416
	95% CL	--	(−14.043, -4.928)	(−14.683, -6.148)
	R²		0.194
Physical functioning	b	--	−6.015	−6.915
	95% CL	--	(−11.315, -0.715)	(−11.867, -1.963)
	R²		0.177

Regression coefficients represent the difference in HRQoL for those with one and two symptoms relative to those without any (e.g., those with one symptom and two or more symptoms reported mental component summary scores 2.786 and 3.905 points less, respectively, than those without symptoms). All models controlled for age, smoking status, pain severity, and pain frequency.

ISSN: 1471-2474