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Table 2 Sample size per treatment arm for various values of ICC and (radj)

From: PALLiON – PALLiative care Integrated in ONcology: study protocol for a Norwegian national cluster-randomized control trial with a complex intervention of early integration of palliative care

    radj   
  0.4 0.3 0.2 0.1 NOa
ICC
0.06 102 120 138 150 150
0.07 126 150 180 198 204
0.08 156 204 258 300b 312
0.09 210 318 468 630 714
  1. ICC intra-cluster correlation coefficient, radj correlation coefficient between outcome and adjustment covariates
  2. aNo adjustment for baseline covariates
  3. bRequired no. of patients per arm