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Information on the type and number of medications taken regularly has been obtained from reports made at five home visits at age 36, 43, 53, 60-64 and 68-70, and from the responses to postal questionnaires at 31 and 60-64 years. Respondents were usually asked if they 'regularly take any medicines, pills or tablets (or have regular injections)?' and asked to complete questions on the reason, duration, name and dosage of any medications taken. The information given was converted into BNF-categorised codes and then onto classes of drug.

The 2006-10 data collection was slightly different, in that study members were asked two sets of medication questions. The postal questionnaire contained the usual phrasing about regular taking of medications, whereas the home visit asked for details of medications taken in the past 24 hours. When the overall derived measures were created, the method used was to combine both postal and home visit data, with priority given to the home visit, unless missing. The nurse undetaking would have seen the medications at the home visit so the accuracy of reporting could be assured.