How to populate days_supply when it is missing in the source data

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How to populate days_supply when days supply is missing the source data

CDM or THEMIS convention?

Themis

Table or Field level?

Field

Is this a general convention?

No

Summary of issues

• There are instances when days_supply for a drug is missing in the source data

Summary of answer

• The CDM documentation states: The field should be left empty if the source data does not contain a verbatim days_supply, and should not be calculated from other fields.

Related links

• CDM documentation: https://ohdsi.github.io/CommonDataModel/cdm54.html#drug_exposure
• Forum posts: https://forums.ohdsi.org/t/days-supply-yet-again/4741/16
• Themis repo ratified convention: Guidance needed for Drug Exposure days_supply field #76

[clairblacketer]

Issue # and location

• Themis issue #125

Issue summary

How should days_supply be populated when it is missing from the source data?

Convention type

Table

CDM table

drug_exposure

CDM field

days_supply

Links to issue discussion

• OHDSI Forums discussion
• THEMIS issue #76

Provenance of data

General

The ratified convention

The field should be left empty if the source data does not contain a verbatim days_supply, and should not be calculated from other fields.

Date of ratification/published

Sept 24, 2021 (CDM v5.4 release date)

Downstream implications

No

Link to DQD check

No

Related conventions/further information

NA

#Tags
drug_exposure, days_supply