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Table 1 Different sample sizes with variable cluster size and design effect for initial sample size of 445 (using the sample size produced from power calculation)

From: Study protocol for valuing EQ-5D-3L and EORTC-8D health states in a representative population sample in Sri Lanka

Cluster size Ρ
0.02 (n of cluster) 0.09 0.5
20 614 (31) 1205 4672
30 703 (23) 1606 6897
40 792 (20) 2006 9122
50 881 (18) 2407 11347
  1. ρ–rate of homogeneity.