Subgroups of older adults with osteoarthritis based upon differing comorbid symptom presentations and potential underlying pain mechanisms

Table 1 Characteristics of the entire study sample (n = 129, 79 female, 50 male)

Variable		Mean (SD)	Range
Age (years)		72.2 (9.8)	65 to 90
BMI (kg/m²)		30.5 (5.9)	21.5 to 49.9
Self-reported race	Caucasian	112 (86.8%)
African American		12 (9.3%)
Asian		2 (1.6%)
More than one		1 (.8%)
Chose not to report		2 (1.6%)
Study joint	knee	88 (68.2%)
hip		41 (31.7%)
% Veterans		26/120 (20.2%)
WOMAC pain		7.9 (3.4)	2 to 20
WOMAC stiffness		3.3 (1.7)	0 to 8
WOMAC disability		20.9 (10.3)	3 to 42
BFI total		4.5 (2.0)	0.25 to 8.75
Self-reported duration of pain (months)		132.1 (146.5)	0 to 708

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