Question
Question Posted 03/21/25:
I am currently working with the ADNI dataset and have noticed that the age at inclusion ("age_bl") is missing for the subject sub-ADNI053S6598. Given the importance of this information for our analysis, I would like to inquire whether it would be possible to retrieve this missing data.
I am currently working with the ADNI dataset and have noticed that the age at inclusion ("age_bl") is missing for the subject sub-ADNI053S6598. Given the importance of this information for our analysis, I would like to inquire whether it would be possible to retrieve this missing data.
Response posted 03/21/25 by Adam Diaz:
Hello,
I'm not sure where the age_bl column comes from (it may be a derived variable in the ADNIMERGE data set), however participant age is not stored as a separate variable within the tabular ADNI data. It must be calculated using the PTDOB field in the participant demographics table and the date associated with the assessment in question - for clinical visits, this is the EXAMDATE field in the registry table.
I'm not sure where the age_bl column comes from (it may be a derived variable in the ADNIMERGE data set), however participant age is not stored as a separate variable within the tabular ADNI data. It must be calculated using the PTDOB field in the participant demographics table and the date associated with the assessment in question - for clinical visits, this is the EXAMDATE field in the registry table.
