Participation Status History (WHI Main Study and Extension)
| File Name | Data as of | Population | Data collected | One row per | Rows |
|---|---|---|---|---|---|
| participation_ctos_inv.dat | 2/15/2025 | CT+OS | Main, Ext1, Ext2 | Status change | 381,592 |
ID - WHI Common ID Col 1
FUSTARTDY - Days since rand/enroll to start of participant`s follow-up status Col 2 Usage Notes: Days since randomization or enrollment to a status of deceased does not represent date of death, but rather the date the participant's status was changed to deceased.
FUENDDY - Days since rand/enroll to end of participant`s follow-up status Col 3 Usage Notes: A missing value indicates this is the last/latest follow-up status recorded for the participant.
FUSTATUS - Participant`s study follow-up status Col 4 Usage Notes: To determine the last/latest follow-up status recorded for a paticipant, use one of the following methods: (1) select the participant record with a missing value for FUENDDY or (2) select the participant record with the greatest FUSTARTDY value. Until determined to be deceased, the last/latest follow-up status for a participant who did not consent to the WHI Extension 1 or Extension 2, is the follow-up status she had at the end of the study period for which she last consented. Note: do not use this data file to determine end of follow-up for time-to-event analyses. Instead use the ENDFOLLOWDY variable in the outc_ct_os_inv.dat file.
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IMPORTANT: This file tracks changes to each participant’s study participation status over time. It can be used to determine adherence to study protocols over time, however it should not be used to determine end of follow-up status for time to event analyses. Instead use the ENDFOLLOWDY variable in the outc_ct_os_inv.dat file.