Table1:

Participant characteristics

	HC (n = 22) Mean ± SD	FM negative (n = 24) Mean ± SD	FM positive (n = 22) Mean ± SD	P value (t test)!	P value (ANOVA)
Age (years)	41.15 ± 8.830	42.38 ± 12.37	43.95 ± 14.00	0.687	0.788
Gender (% Female)	68%	63%	77%	0.277	0.552
BMI	28.35 ± 8.10	28.76 ± 6.20	31.34 ± 6.13	0.163	0.296
Race				0.576	0.316
White	68.00%	66.70%	72.70%
Black	5%	16.70%	13.70%
Asian	18.00%	4.20%	0.00%
More than one race	9.00%	0.00%	4.55%
Other	0.00%	0.00%	4.55%
Pain average (NRS)	-----------	4.13 ± 1.12	5.27 ± 1.49	< 0.01*
Pain duration (months)	-----------	75.04 ± 104.87	135.09 ± 171.12	0.155
number of pain locations	-----------	4.50 ± 1.79	9.77 ± 3.84	< 0.001*
Opioid use (%Yes)	-----------	0%	36%	< 0.001*

FM: Fibromyalgia

HC: Healthy controls

BMI: Body mass index, NRS: Numeric rating scale

^!:Comparisons of FM negative CLBP participants and FM negative CLBP participants