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Table 2

Cluster membership at 7 years stratified by the original study cluster (n=155)

Original study clusterNumber of people in the original study clustern (%)* in each cluster (trajectory) at 7 years
No or occasional painPersistent mild painFluctuating painPersistent severe pain
Recovering5734 (59)18 (32)3 (5)2 (4)
Persistent mild5112 (23)29 (56)8 (15)2 (5)
Fluctuating161 (7)6 (38)2 (13)7 (42)
Severe chronic310 (0)4 (12)4 (14)23 (74)

*Estimated following multiple imputation.

Weighted κ=0.54 (95% CI 0.42 to 0.65).

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