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Table 2 Cluster size by study wave, site and treatment arm

From: Feasibility cluster randomised controlled trial evaluating a theory-driven group-based complex intervention versus usual physiotherapy to support self-management of osteoarthritis and low back pain (SOLAS)

Wave SOLAS intervention Usual physiotherapy
Site code Target recruitment Cluster size recruited Site code Target recruitment Cluster size recruited
W1 Autumn 2014 Aa 6 2 H 6 3
B 6 6 Ia 6 7
C 6 4 Ja 6 6
D 6 5 K 6 3
    L 6 3
Subtotal 4 24 17 5 30 22
Mean cluster size   4.3    4.4
W2 Spring 2015 B 6 4 H 6 4
C 6 5 K 6 4
D 6 4 L 6 7
Ea 6 7 M 6 6
F 6 6 N 6 8
G 6 5    
Subtotal 6 36 31 5 30 29
Mean cluster size   5.2    5.8
W3 Autumn 2015 F 6 6 M 6 1
G 6 5 N 6 9
Subtotal 2 12 11 2 12 10
Mean cluster size   5.5    5.0
Total 7 72 59 7 72 61
  1. aSites that participated in the pilot trial in Spring 2014 [13] participated in one recruitment wave during the feasibility trial