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Table 1 Total trial sample size at various correlations between endpoints

From: Ultra-low dose of rituximab in rheumatoid arthritis: study protocol for a randomised controlled trial

SD change r Sample size 1000 mg arm Total trial size (5 x sample size in 1000 mg arm)
0.9 0.17 26 130
0.8 0.35 24 120
0.7 0.5 20 100
0.6 0.63 16 80