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Table 1 Number of participants within the 14 different strata's divided into the two groups.

From: Implementation of neck/shoulder exercises for pain relief among industrial workers: A randomized controlled trial

  TRAINING GROUP CONTROL GROUP
Stratum Participants (N) Clusters (N) Cluster size (range) Participants (N) Clusters (N) Cluster size (range)
A 44 7 3-12 58 8 1-15
B 24 3 1-12 27 3 8-11
C 12 3 1-8 10 1 10
D 5 1 5 7 1 7
E 6 1 6 4 1 4
F 9 2 3-6 10 2 3-7
G 36 3 1-27 28 3 5-12
H . . . 4 1 4
I 60 3 2-37 19 2 9-10
J . . . 33 1 33
K 23 1 23 . . .
L 24 1 24 40 1 40
M 34 4 4-11 13 2 3-10
N 5 1 5 2 1 2
Total 282 30   255 27  
  1. The number of clusters and the range of the cluster size are specified for each stratum.