Based on the different sources from which cannabis use was ascertained, you are concerned that the..

Based on the different sources from which
cannabis use was ascertained, you are concerned that the design of this study
could have led to a spuriously large association of recent cannabis use with
collision risk. Why?

1. In this analysis, the means of exposure
assessment were not comparable for the two periods of time: blood metabolite
levels for the case period, recall for the control period. Incomplete
ascertainment of cannabis use during the control period by means of an interview
would have led to a falsely large estimate of the association.

(Indeed, the authors provide some

Based on the different sources from which
cannabis use was ascertained, you are concerned that the design of this study
could have led to a spuriously large association of recent cannabis use with
collision risk. Why?

1. In this analysis, the means of exposure
assessment were not comparable for the two periods of time: blood metabolite
levels for the case period, recall for the control period. Incomplete
ascertainment of cannabis use during the control period by means of an interview
would have led to a falsely large estimate of the association.

(Indeed, the authors provide some evidence
that the interview did not accurately elicit use: In reporting on their use of
cannabis within six hours of the collision, nearly half of the persons with
metabolites identified in blood claimed no recent use.)

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