Arab Board Community Medicine Final Written Practice Questions - Arab Board Of Health Specializations (ABHS) Community Medicine Final Written Examination Exam

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In an observational cohort study evaluating survival among patients with heart failure who receive implantable cardioverter-defibrillators (ICDs), person-time is counted from the time of diagnosis, but ICD implantation occurs at variable intervals months later. Counting the pre-implantation observation time as 'exposed' person-time would introduce which methodological error?

Immortal time bias Protopathic bias Verification bias Attrition bias

Correct Answer:

Immortal time bias

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