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. Author manuscript; available in PMC: 2014 Nov 1.
Published in final edited form as: J Neurol Neurosurg Psychiatry. 2013 Aug 2;84(11):1233–1239. doi: 10.1136/jnnp-2013-305114

Table 4. Required single-arm sample size for a hypothetical randomized clinical trial.

Month α Effect
(%)		 Single
N
24 0.05 40 247
24 0.05 50 158
24 0.05 60 110
24 0.05 70 81
24 0.10 40 195
24 0.10 50 125
24 0.10 60 86
24 0.10 70 64
36 0.05 40 105
36 0.05 50 67
36 0.05 60 47
36 0.05 70 34
36 0.10 40 83
36 0.10 50 53
36 0.10 60 37
36 0.10 70 27