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

Table 3 Discriminative analysis of cluster characteristics^a

Variable	Cluster 1	Cluster 2	Cluster 3
Constant	-27.56	-13.30	-8.72
CES-D	.49	.30	.09
BFI	2.89	1.93	1.23
Sleep disturbance	1.01	.40	.88
Pain	.85	.17	1.20
Illness burden	1.04	1.05	.27

^aValues are the coefficients for discriminant functions for each cluster. Values in boldface indicate the variable loads highest for that particular cluster.