Table 1 Clustering variables across clusters (total population) and proportion meeting research criteria for fibromyalgia
N | Cluster 1 | Cluster 2 | Cluster 3 | Cluster 4 |
|---|---|---|---|---|
32 | 347 | 427 | 462 | |
Mean (95% CI) | Mean (95% CI) | Mean (95% CI) | Mean (95% CI) | |
Clustering Factors | ||||
 Extra-spinal manifestation & comorbidity count | 3.3 (2.7, 3.9) | 1.3 (1.1, 1.4) | 0.7 (0.6, 0.8) | 1.2 (1.1,1.3) |
 Swollen joint count | 8.1 (5.5, 10.7) | 0.1 (0.03, 0.2) | 0.05 (0.01, 0.1) | 0.1 (0.05, 0.13) |
 Tender joint count | 14.3 (11.2, 17.3) | 0.4 (0.2, 0.5) | 0.2 (0.1, 0.3) | 0.4 (0.3, 0.6) |
 Anxiety score | 10.5 (8.6, 12.5) | 12.2 (11.8, 12.5) | 3.6 (3.4, 3.9) | 4.5 (4.2, 4.7) |
 Depression score | 9.2 (7.6, 10.8) | 10.3 (10.0, 10.7) | 2.2 (2.0, 2.4) | 5.2 (5.0, 5.5) |
 Fatigue score | 7.1 (5.9, 8.3) | 8.0 (7.7, 8.3) | 0.9 (0.8, 1.1) | 3.2 (2.9,3.4) |
 Sleep disturbance score | 14.4 (12.4, 16.5) | 14.5 (14.0, 15.0) | 3.9 (3.6, 4.2) | 11.2 (10.7, 11.6) |
FM research criteria (and components) | ||||
 Proportion positive (%) | 53% | 54% | 4% | 16% |
 Widespread pain index | 7.2 (6.0, 8.5) | 7.4 (7.0, 7.8) | 2.9 (2.7, 3.2) | 5.0 (4.7, 5.3) |
 Symptom severity score | 7.9 (6.9, 8.9) | 8.4 (8.2, 8.7) | 2.7 (2.5, 2.9) | 5.4 (5.2, 5.6) |