Table 2.

Sample size per treatment arm for various values of ICC and (r_adj)

			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

ICC intra-cluster correlation coefficient, r_adj correlation coefficient between outcome and adjustment covariates

^aNo adjustment for baseline covariates

^bRequired no. of patients per arm