Sir,

We highly appreciate Dr AD Tsakok's interest in our recently published paper.1 In his letter,2 he suggests a different approach to the statistical problem which we solved using either Student's two-sample t-test or analysis of variance (ANOVA). Dr Tsakok argues that the shortcoming of our statistical approach lies in the assumption of equal variances between groups (Behrens-Fisher problem3, 4). In his opinion, this assumption renders the applied tests unsuitable for the purposes to which they were put. Dr Tsakok advocates a statistical test that he himself has developed to compare quantitative data between multiple groups,5 and which is already available as commercial software.

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