Physical Activity and Sleep in Chronic Fatigue Syndrome and Fibromyalgia Syndrome: Associations with Symptom Severity in the General Population Cohort LifeLines

Table 2

Associations between physical activity, sleep duration, and symptom severity.

	CFS		FMS		Controls
	B	95% CI	B	95% CI	B	95% CI
Linear
(1) Physical total activity score	−0.007	−0.047, 0.032	−0.009	−0.031, 0.012	−0.007	−0.009, −0.004
(2) Sleep duration	−0.005	−0.045, 0.036	−0.009	−0.036, 0.017	−0.004	−0.008, −0.001
Quadratic
(3) Physical total activity score (linear term)	−0.042	−0.091, 0.008	−0.046	−0.073, −0.020	−0.009	−0.012, −0.006
Physical total activity score (quadratic term)	0.020	0.003, 0.038	0.019	0.011, 0.027	0.001	0.001, 0.002
(4) Sleep duration (linear term)	−0.045	−0.089, 0.00	−0.021	−0.047, 0.005	−0.007	−0.011, −0.003
Sleep duration (quadratic term)	0.017	0.008, 0.025	0.040	0.031, 0.049	0.00	0.00, 0.00

CFS = chronic fatigue syndrome; FMS = fibromyalgia syndrome. . Multivariable regression analyses were done, adjusted for age, sex, BMI, smoking, and education.