Add Health is excited to announce that beginning in September 2024, we will release restricted-use data in SAS7BDAT format instead of SAS Transport XPT format. In addition, the structure for the reserve codes that explain missing values will be changed. The old version, which were of dynamic length based on the values in the variable, will be replaced with negative values of consistent length. Details of these new reserve codes will be included in all future user guides.
September 11, 2024
New Data Format for Add Health Restricted-Use Data
