Question
Question Posted 06/20/25:
In the PTDEMOG sheet, some values for the column "PTRACCAT" are not single values, but two values separated by a pipe, e.g. "4|5". How should these values be interpreted? There is no mention of this type of value in the data dictionary. Thank you.
In the PTDEMOG sheet, some values for the column "PTRACCAT" are not single values, but two values separated by a pipe, e.g. "4|5". How should these values be interpreted? There is no mention of this type of value in the data dictionary. Thank you.
Response posted 06/23/25 by Adam Diaz:
The PTRACCAT field is based on participant self-report, and participants in ADNI4 have the option to select more than one option. Entries formatted along the lines of x|y indicate that the participant selected both options x and y in the questionnaire - so, in this case, 4|5 indicates that the participant identified as both Black and White. In previous phases, such responses were recorded as 6 (more than one race).
