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Table 4 Similaritya of baseline clusters to the 3, 6, 9 & 12 months clusters

From: Phenotyping of difficult asthma using longitudinal physiological and biomarker measurements reveals significant differences in stability between clusters

Baseline Cluster (n) 3 months Cluster Similarity (n) 6 months Cluster Similarity (n) 9 months Cluster Similarity (n) 12 months Cluster Similarity (n)
A (15) A 0.30 (6) A 0.39 (6) A 0.38 (7) A 0.40 (8)
A B 0.05 (1) B 0.00 (0) B 0.05 (1) B 0.00 (0)
A C 0.05 (1) C 0.08 (2) C 0.04 (1) C 0.08 (2)
A D 0.35 (7) D 0.20 (7) D 0.19 (6) D 0.15 (5)
B (17) A 0.10 (2) A 0.05 (1) A 0.06 (1) A 0.05 (1)
B B 0.73 (15) B 0.91 (15) B 0.82 (16) B 0.97 (16)
B C 0.00 (0) C 0.00 (0) C 0.00 (0) C 0.00 (0)
B D 0.00 (0) D 0.03 (1) D 0.00 (0) D 0.00 (0)
C (39) A 0.28 (9) A 0.10 (3) A 0.07 (2) A 0.19 (6)
C B 0.13 (4) B 0.00 (0) B 0.07 (2) B 0.00 (0)
C C 0.72 (23) C 0.89 (33) C 0.86 (33) C 0.81 (29)
C D 0.07 (3) D 0.07 (3) D 0.04 (2) D 0.09 (4)
D (54) A 0.20 (8) A 0.27 (10) A 0.14 (5) A 0.25 (10)
D B 0.10 (4) B 0.03 (1) B 0.08 (3) B 0.00 (0)
D C 0.03 (1) C 0.00 (0) C 0.09 (4) C 0.05 (2)
D D 0.78 (41) D 0.80 (43) D 0.81 (42) D 0.80 (42)
  1. aSimilarity indices between two clusters were calculated using Sorensen’s Index, as SI = 2ab/(a + b), where a is the number of subjects found in cluster A; b is the number of subjects in cluster B and ab is the number of subjects shared by both the cluster