Table 1.

Demographic and clinical variables of the fibromyalgia syndrome patients and healthy controls

	FMS (n = 90) (mean ± SD (range))	HC (n = 30) (mean ± SD (range))
Age (years)	48.17 ± 10.32 (21–68)	48.22 ± 9.02 (22–65)
Duration of pain (years)	9.28 ± 9.23 (0.5–45)
Painful regions	6.80 ± 2.05 (3–12)
Number of tender points	16.09 ± 3.33 (14–18)	2 ± 0.33 (0–4)
Mean tender points pain severitya	5.89 ± 2.27 (2–10)	3.13 ± 1.06 (0–3)
Use of antidepressive medications (number)	0.36 ± 0.52 (0–3)	0.21 ± 0.03 (0–2)
Occupational status	N (%)	N (%)
Working	39 (43.3)	17 (56.8)
Unemployed	20 (22.2)	9 (30.0)
Workers' compensation	24 (26.7)	0 (0.0)
Retired	6 (6.7)	2 (6.6)
Student	1 (1.1)	2 (6.6)

^aVisual analogue scale ranges from 0 = no pain to 10 = most intense pain. FMS, fibromyalgia syndrome; HC, healthy control; SD, standard deviation.