Table 3

Characteristics of 2-steps 3-cluster analysis solution for 164 subjects with no medical or psychiatric exclusions.

Characteristic
Cluster 1 Most Severe (n = 30)
Cluster 2 Intermediate (n = 67)
Cluster 3 Least Severe (n = 67)

     SF-36 Scales (mean ± sd)



Physical function
49.5 ± 21.8
71.8 ± 20.1
91.0 ± 10.3
Role physical
12.5 ± 26.9
48.1 ± 36.0
92.5 ± 19.5
Bodily pain
39.5 ± 18.3
53.7 ± 16.5
79.4 ± 15.6
General health
45.4 ± 19.3
67.4 ± 13.8
85.3 ± 12.6
Vitality
14.3 ± 11.0
34.6 ± 15.8
69.6 ± 16.0
Social function
45.4 ± 24.0
67.9 ± 18.4
96.3 ± 8.7
Role emotional
47.8 ± 41.7
74.1 ± 35.2
96.0 ± 13.6
Mental health
61.5 ± 19.5
74.4 ± 13.5
86.9 ± 9.1
     MFI Scales (mean ± sd)



General fatigue
18.4 ± 1.4
15.1 ± 2.7
8.7 ± 3.2
Physical fatigue
15.4 ± 2.7
11.6 ± 2.8
6.7 ± 2.1
Mental fatigue
15.9 ± 3.5
10.3 ± 3.9
6.6 ± 2.7
Reduced motivation
13.4 ± 4.0
10.3 ± 3.0
6.2 ± 2.0
Reduced activity
15.8 ± 3.3
11.9 ± 3.5
5.9 ± 2.0
Symptom Inventory (mean ± sd)
52.2 ± 24.8
21.6 ± 12.6
7.0 ± 8.5

All clusters were significantly different from the other clusters with respect to all scales

Reeves et al. BMC Medicine 2005 3:19   doi:10.1186/1741-7015-3-19