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Outcomes count in Cohort Method Data

Hi all,

the cohortMethodData provides a number of outcomes (e.g. if use summary(cmData) command).

The number of outcomes provided by cohortMethodData is very different to the initial counts we have in outcome cohort. I assume that cohortMethodData includes only those outcomes that are presented in target or comparator cohorts. Is that correct or there might be some other reasons?

BR,

Yuriy

That’s correct. The outcome count is after:

  • Restricting to people in the target and comparator cohort
    • After imposing additional CohortMethod criteria as specified by the user, such as imposing a washout window, removing subjects in both cohorts, removing people who have the outcome prior to the index date, etc.
    • After any matching / trimming
  • Restricting to the user-defined time-at-risk
  • If using a survival model: restricted to the first outcome per person

So the counts will likely be very different from the raw cohort counts.

t