Response to "Comment on cognitive function in the context of pharmacogenetic CYP2D6 variability and anticholinergic burden in older adults - results from the ActiFE study".

We clarify that our analyses were exploratory and hypothesis-generating, with systematic stratification across CYP2D6 metaboliser groups rather than selection based on an interaction p < 0.2 threshold. A post-hoc Benjamini-Hochberg sensitivity analysis provided supportive, but not confirmatory, evidence for the hypothesised stronger association between anticholinergic burden and cognitive function among individuals with reduced CYP2D6 activity. Given the limited subgroup sizes, ceiling effects, and generally high cognitive performance of the cohort, these findings should be considered hypothesis-generating.