STEPS IN PLANNING A COHORT STUDY

• Choosing among cohort design

  • Retrospective cohort design

    • economical
    • quickest
  • Prospective cohort design

    • outcomes that occur very frequently e.g., discharge to a nursing home after hospitalization for a hip fracture.
    • When less expensive approaches fail to answer the important questions satisfactorily
    • When good case-control studies have produced results conflict
    • When certain key measurements must be made before the outcome occurs.

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