Sustained Effects of Memory and Lifestyle Interventions on Memory Functioning of Older Adults: An 18-Month Follow-Up Study.

If the required sample size for a variable is within the range expected for practical significance (e.g., n < 91 per group, estimated based on a power of 0.80, an alpha level of 0.05 and the minimum effect size representing a practically significant effect, i.e., η p 2 = 0.04; Ferguson, 2009 ), the lack of significant group difference in this variable could be due to an insufficient statistical power, which warrants further studies.

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