Anchor and Index Date Rules

MCL anchor date rules for data de-identification

Anchor date, for recording offset:

Group

Anchor CDE

Suggestion for alternate

Comment

Breast

First positive biopsy date

First positive biopsy confirming diagnosis date

 

Prostate

Date of diagnosis on prostate biopsy

First positive biopsy confirming diagnosis date

Make consistent with breast?

Pancreas

First imaging date

   

Lung

Lesion high suspicion imaging date

First imaging date

Make consistent with pancreas?

 

Operationalizing date offset:

 

Example: DATE OF PARTICIPANT ENROLLMENT

 

Breast patient – first positive biopsy date is 01/01/2018

Actual date of participant enrollment is 03/01/2018

 

The CDE being captured is “Date of participant enrollment number of days from anchor date”
Value for that CDE is 59

(where the anchor date is day 0)

 

Value of CDE can be positive or negative.