The possibility of using published clinical trial data from CAMD for a comparison of the development of MMSE scores in patients with AD in cohort studies was investigated. A research design for such a comparison was developed. CAMD trial data were accessed and cleaned for the analysis and Whitehall II was identified as a cohort study containing the relevant information for a comparison. Due to delays in the access to relevant Whitehall II data, the final analysis could not be conducted.