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Table 3 Clustering variables across clusters and fibromyalgia criteria sub-scale scores (amongst participants who met criteria for fibromyalgia)

From: AxSpA patients who also meet criteria for fibromyalgia: identifying distinct patient clusters using data from a UK national register (BSRBR-AS)

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)