Table 1.

Characteristics of study participants.

	Non-Hispanic Blacks	Non-Hispanic Whites	p-values
Chronic Low Back Pain Cases
	(n = 25)	(n = 24)
Age, mean (SD)	43.5 (10.6)	45.8 (14.9)	0.541
Sex, N (%)
Men	9 (36)	12 (50)	0.321
Women	16 (64)	12 (50)
BPI, mean (SD)
Severity	5.9 (2.2)	3.4 (1.9)	<0.001
Interference	4.4 (2.8)	2.8 (2.0)	0.077
Pain-Free Controls
	(n = 24)	(n = 25)
Age, mean (SD)	40.7 (16.5)	39.3 (12.6)	0.749
Sex, N (%)
Men	13 (54.2)	12 (48)	0.778
Women	11 (45.8)	13 (52)
BPI, mean (SD)
Severity	0.1 (0.5)	0.1 (0.1)	0.891
Interference	0.1 (0.5)	0	0.19

Notes: SD = standard deviation, BPI = brief pain inventory.