20003 Treatment/medication code
I would like to know the 20003 Treatment/medication code corresponding to the time of use of the medication, for example, at instance 0 it is recorded that the participant used the medication A, but at instance 1 there is no record of the use of the medication A. Is the time of use of the medication A by the participant before instance 0? Or was it between instance 0 and instance 1 (the drug A was not used at the time between instance 1 and instance 2)?
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Hi Alex,
Field 20003 holds information on the treatments/medications that a participant reports that they are taking at time of each assessment centre visit. The date of the visit (and therefore the date on which the participant reported that they were taking the medication) for each participant can be found in Field 53 (linking on eid and instance). At the assessment centre visits the participants are asked, using a touchscreen questionnaire, a series of questions about medications that they "take regularly". In addition to the touch screen questionnaire participants are asked verbally by a nurse about medications they are taking. Since the recording of these medications are done only at the assessment centre visits, they represent a snapshot in time. A participant may therefore be taking a medication regularly at the baseline visit and not at their first imaging visit but participants are not questioned on when they started or stopped taking that medication.
Please note that the self-report medication data categories are only current to 2010, so newer medications may not be reflected in the responses. Additional medication information is present in linked GP prescription records for 45% of the cohort (currently censored at 2016/7), as well as in procedure codes within the inpatient data for some medications, though comprehensive data on inpatient medications is not currently available. For more specific information on sources of medication data, please see Resource 596 (https://biobank.ndph.ox.ac.uk/ukb/refer.cgi?id=596), particularly Appendix C: Information on medications.
I hope this has been helpful.
Kelly
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