Letter to the Editor: Double-counting due to inadequate statistics leads to false-positive findings in "Effects of creatine supplementation on memory in healthy individuals: a systematic review and meta-analysis of randomized controlled trials".

Prokopidis et al have conducted a meta-analysis of randomized, placebo-controlled clinical trials to assess the effects of oral creatine supplementation on memory performance of healthy individuals. However, concerns were raised regarding the validity of their statistical analyses, which may have led to misleading conclusions. In this letter, we describe the statistical issue at hand and its potential implications.