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. 2010 Apr;2010(40):97–103. doi: 10.1093/jncimonographs/lgq011

Table 3.

Estimated number of groups needed per condition by intraclass correlation (ICC) and average number of subjects per group

Average No. of subjects per group ICC
.05 .06 .08
25 22 24 28
50 17 19 23
75 15 18 22