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Table 4 Sample sizes for a main study according to a range of effects

From: Feasibility of a randomized single-blind crossover trial to assess the effects of the second-generation slow-release dopamine agonists pramipexole and ropinirole on cued recall memory in idiopathic mild or moderate Parkinson’s disease without cognitive impairment

Sample size Mean difference Standardized effect: mean difference/(SD/√2)
25 0.176 0.958
50 0.122 0.662
75 0.099 0.536
100 0.085 0.463
125 0.076 0.413
150 0.069 0.377
175 0.064 0.348
200 0.060 0.326
225 0.056 0.307
250 0.054 0.291
275 0.051 0.277
300 0.049 0.266
  1. SD standard deviation