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Table 1 Exposure Definitions

From: A novel weighting method to remove bias from within-subject exposure dependency in case-crossover studies

 

Case period

Control periods

Definition I

Last day

Last day

Definition II

Last day

Half or more days

Definition III

Last day

Any 1 day

Definition IV

Any 1 day

Any 1 day

  1. Last day = exposure status of the period was the exposure status on the last day; Half or more days = exposure status of the period is defined as ‘exposed’ if at least half of days during the period was exposed and ‘unexposed’ otherwise; Any 1 day = exposure status of the period is defined as ‘exposed’ if at least 1 day during the period is exposed and ‘unexposed’ otherwise