Table 1.

Demographic data of HC subjects and patients with CNBP and FM

Demographic data	CNBP		FM
	Patients (N = 16)	Control (N = 16)	Patients (N = 19)	Control (N = 19)
Age (years)
Mean (SD)	38 (11)	36 (11)	45 (13)	43 (12)
Range	20–50	20–49	19–68	20–61
Sex (N, male/female)	8/8	8/8	0/19	0/19
Race/ethnicity [N (%)]
African American	0	1 (6)	1 (5)	1 (5)
Caucasian	14 (88)	15 (94)	16 (84)	18 (95)
Hispanic	1 (6)	0	2 (11)	0
Native American	1 (6)	0	0	0
Pain duration (years)
Median (IQR)	5.0 (3.8)		4.0 (6.5)
Range	2–15		1–18
Pain intensity (VAS)
Mean (SD)	49 (20)		59 (17)
Range	10–80		24–83

Pain intensity was measured on a 0–100 visual analog scale (VAS). IQR, Interquartile range.