Understanding Society User Support

Hello Max

The variable "age_dv" represents the age, in completed years, at the time of the interview. It is calculated using the date of birth stored in the sample administration database and the interview date (intdatd_if, intdatm_if, intdaty_if). If the date of birth is missing, it uses current and previous wave values of "dvage" to compute "doby_dv".

To create your own variable, you'll need access to SN6931 for the month of birth, which you already have, and to SN6676 (a controlled study) for the day of birth. For access levels and conditions, please refer to this link https://ukdataservice.ac.uk/find-data/access-conditions/.

Alternatively, you may consider using the BHPS variable "bw_age," which measures the age at the date of the interview. You could rename or create a new variable, i.e., "age_proxy" to match the name in both studies and continue using the syntax mentioned.

I hope this information is helpful.

Best wishes,
Roberto Cavazos
Understanding Society User Support Team