Table 3 Clustering variables across clusters and fibromyalgia criteria sub-scale scores (amongst participants who met criteria for fibromyalgia)
N | Cluster 1 | Cluster 2 | Cluster 3 |
|---|---|---|---|
17 | 157 | 120 | |
Mean (95% CI) | Mean (95% CI) | Mean (95% CI) | |
Clustering Factors | |||
 Extra-spinal manifestation & comorbidity count | 3.7 (2.8, 4.6) | 1.5 (1.2, 1.7) | 1.3 (1.0, 1.5) |
 Swollen joint count | 7.1 (4.2, 10.0) | 0.08 (0.002, 0.16) | 0.1 (0.01, 0.13) |
 Tender joint count | 15.0 (11.7, 18.3) | 0.5 (0.2, 0.8) | 0.4 (0.1, 0.7) |
 Anxiety (HADs - scored 0–21) | 12.5 (9.8, 15.1) | 13.2 (12.6, 13.7) | 8.1 (7.5, 8.7) |
 Depression (HADs - scored 0–21) | 10.8 (8.7, 12.9) | 11.2 (10.7, 11.7) | 6.2 (5.7, 6.7) |
 Fatigue (Chalder Fatigue - scored 0–11) | 8.9 (7.6, 10.2) | 8.5 (8.1, 8.9) | 4.6 (4.0, 5.2) |
 Sleep disturbance (Jenkins - scored 0–20) | 18.1 (16.6, 19.6) | 16.0 (15.4, 16.6) | 10.1 (9.1, 11.1) |
FM components | |||
 Widespread pain index | 9.4 (7.7, 11.0) | 9.2 (8.6, 9.8) | 7.9 (7.3, 8.4) |
 Symptom severity score | 9.5 (8.6, 10.4) | 9.7 (9.4, 10.0) | 7.5 (7.2, 7.9) |