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

Table 1

Sample characteristics.

				Pairwise comparisons^c; value
	CFS	FMS	Controls	CFS vs FMS	CFS vs controls	FMS vs controls
Mean (SD)
Number (%)	943 (1.0)	2714 (3.0)	87532 (95.7)
Age^a	44.9 (11.6)	48.4 (10.7)	44.3 (12.4)	<0.001	0.137	<0.001
BMI (kg/m^2)^a	26.4 (4.8)	27.8 (5.3)	26.0 (4.3)	<0.001	0.407	<0.001
Symptom severity (1–5)^a	2.0 (0.6)	2.0 (0.5)	1.5 (0.4)	0.038	<0.001	<0.001
(%)
Education^b
Low	319 (33.8)	1193 (44.0)	25,418 (29.0)	<0.001	<0.001	<0.001
Middle	377 (40.0)	1055 (38.9)	34,211 (39.1)
High	213 (22.6)	377 (13.9)	25,697 (29.7)
Female^b	601 (63.7)	2485 (91.6)	50,705 (57.9)	<0.001	<0.001	<0.001
Smoking^b	257 (27.3)	609 (22.4)	18,520 (21.2)	0.002	<0.001	0.145

CFS = chronic fatigue syndrome; FMS = fibromyalgia syndrome. ^aANOVA; ^bχ² test; ^cBonferroni correction for continuous and χ² test for categorical variables.