Table 1.

Demographic and clinical characteristics of subjects with fibromyalgia (n = 14), healthy controls (n = 14) and rheumatoid arthritis (n = 14).

Variable	Fibromyalgia		Healthy control		Arthritis		p*
	Mean	SD	Mean	SD	Mean	SD
Age	48.8	9.1	48.9	4.7	54.5	6.5	n.s.
State-Trait Anxiety Inventory
State	47.2	14.3	33.3	5.6	33.6	5.7	<0.001
Trait	46.3	11.9	32.8	6.6	32.9	5.7	<0.001
Beck Depression Inventory	17.0	10.2	4.1	2.8	7.0	4.8	<0.001
Pain Disability Index	41.1	12.9	2.7	3.4	17.1	12.1	<0.001
	n	%	n	%	n	%
Education
No completed	3	21.4	0	0.0	0	0.0	n.s.
Apprenticeship	9	64.3	9	64.3	11	78.6
College/university	2	14.3	5	35.7	3	21.4
Occupational invaliditya
No	6	42.9	14	100.0	11	78.6	<0.01
Yes (complete or partial)	8	57.1	0	0.0	3	21.4
Any psychiatric diagnosisb	8	57.1	0	0.0	2	14.3	<0.01
Major depressive disorder	3	21.4	0	0.0	1	7.1
Any anxiety disorder	7	50.0	0	0.0	2	14.3
Panic disorder	3	21.4	0	0.0	1	7.1
Agoraphobia	3	21.4	0	0.0	1	7.1
PTSD	3	21.4	0	0.0	0	0.0
Medication
Antidepressants	8	57.1	0	0.0	1	7.1
Anxiolytics	1	7.1	0	0.0	1	7.1
Opioids	1	7.1	0	0.0	1	7.1

^*Chi-square test, Fisher’s exact test or analysis of variance when appropriate.

^aCompensation by the insurance.

^bMultiple diagnosis possible.

PTSD, posttraumatic stress disorder; SD, standard deviation.