Table 3.

Clinical pain and psychological measures across the clusters adjusted for race and study site.

	Cluster 1 Higher Function Minimal Movement-Evoked Pain (n=145)	Cluster 2 Moderate Function Mild Movement- Evoked Pain (n=101)	Cluster 3 Lower Function Severe Movement- Evoked Pain (n=24)	Adju sted p- value
Characteristic Pain Intensity, mean ± SD	41.8 ± 20.0	57.5 ± 18.2	79.2 ± 11.6	<0.0001
WOMAC-Pain, mean ± SD	5.4 ± 3.4	8.6 ± 3.5	13.2 ± 3.3	<0.0001
WOMAC- Stiffness, mean ± SD	2.8 ± 0.7	3.9 ± 0.8	5.5 ± 1.0	<0.0001
WOMAC-Function, mean ± SD	17.8 ± 11.9	27.6 ± 12.6	42.0 ± 10.5	<0.0001
# of Pain Sites, mean ± SD	4.5 ± 3.8	5.8 ± 3.7	9.0 ± 4.8	<0.0001
# of Pain Days Past 6 mo., mean ± SD	7.5 ± 14.8	20.7 ± 38.9	40.3 ± 56.9	<0.0001
CES-D, mean ± SD	8.2 ± 6.7	10.8 ± 7.9	12.9 ± 7.2	0.003
CSQ- Active Coping, mean ± SD	2.7 ± 0.9	3.2 ± 0.9	3.4 ± 1.0	0.001
CSQ- Passive Coping, mean ± SD	2.8 ± 1.2	2.9 ± 1.1	3.6 ± 1.0	0.004
CSQ- Catastrophizing, mean ± SD	1.5 ± 0.9	1.7 ± 1.1	2.4 ± 1.2	<0.0001
PVAQ, mean ± SD	44.6 ± 14.7	45.4 ± 13.7	56.3 ± 10.3	<0.0001
Positive Affect, mean ± SD	35.4 ± 7.5	35.6 ± 7.8	36.4 ± 8.7	0.832
Negative Affect, mean ± SD	13.7 ± 4.6	15.7 ± 6.5	15.1 ± 6.5	0.050