An observation period is currently described as:
This table contains records which define spans of time during which two conditions are expected to hold: (i) Clinical Events that happened to the Person are recorded in the Event tables, and (ii) absense of records indicate such Events did not occur during this span of time.
However, in many datasets this does not hold. Non-reimbursed and over-the-counter drugs are a good example. Another example are registries that only collect specific variables. Newcomers might doubt, not add the observation periods, and then discover some OHDSI tools don’t work without observation periods added.
Therefore I propose to change the definition to:
“… (i) Clinical events that happened to the Person and are expected to be collected in the context of the dataset are recorded in the Event tables …”
Any thoughts before making this a Themis proposal?