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Table 1 Clustering variables across clusters (total population) and proportion meeting research 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 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)