. Author manuscript; available in PMC: 2017 Jan 1.

Published in final edited form as: Arthritis Care Res (Hoboken). 2016 Jan;68(1):99–107. doi: 10.1002/acr.22626

Table 2.

Discriminant function analysis for sub-cluster characteristics

		Saturation loading	Classification function coefficients

			FM Sub-cluster 1	FM Sub-cluster 2
Widespread pain		0.979	2.217	0.815
Symptom severity	Fatigue	0.189	1.167	1.293
Symptom severity	Unrefreshed waking	0.143	2.078	1.674
	Cognitive symptoms	0.152	−1.092	−0.547
	Somatic symptoms	0.257	5.185	3.960
Constant			−24.990	−8.926

χ² (df) = 130.990 (5), p < 0.001; Eigenvalue of function 1 = 2.108; 100% variance