title: Drug exposure risk windows and unexposed comparator groups for cohort studies in pharmacoepidemiology.
abstract: OBJECTIVE
  To determine the appropriate size of risk windows in both exposed and unexposed sub-cohorts.
  
  
  METHODS
  Data was taken from a previous study of upper gastrointestinal haemorrhage and perforation. The length of each prescription for NSAIDs was estimated. The risk was calculated for the duration of a prescription plus increments of -30, -25,..., +115, +120 (i.e. 31 increments). Ten unexposed groups were re-sampled for each increment (stratified for age and sex), using the same lengths of risk window as the exposed group. Mean risks and rate-ratios were calculated (per thousand person-years).
  
  
  RESULTS
  The NSAID risk rose from 3.52 at -30 days to a peak of 5.82 at -15 days, and then decreased gradually to 2.83 at +120 days. Unexposed risk was variable for the negative increments, and decreased gradually from 2.16 at +0 days to 1.54 at +120 days. The rate-ratio rose from 1.55 at -30 days to a peak of 2.85 at -5 days, and then decreased to 1.85 at +120 days.
  
  
  CONCLUSIONS
  Risk windows should be the same as (or slightly less than) the calculated length of a prescription. Lengthy windows should not be used for unexposed comparator groups (the exposed windows may be randomly allocated).
authors.affiliation: Department of Clinical Pharmacology, University of Dundee, Scotland, UK. alex@memo.dundee.ac.uk
authors.forename: A D
authors.initials: AD
authors.lastname: McMahon
authors.forename: J M
authors.initials: JM
authors.lastname: Evans
authors.forename: M M
authors.initials: MM
authors.lastname: McGilchrist
authors.forename: D G
authors.initials: DG
authors.lastname: McDevitt
authors.forename: T M
authors.initials: TM
authors.lastname: MacDonald