Date of birth and age were asked for each reporting unit member, and then exact age was calculated from date of birth. Where the calculated age and the age provided did not match, inconsistencies were reviewed and resolved. When date of birth was not provided, but age was provided, the month and year of birth were assigned randomly from among the possible valid options. For any cases still not accounted, age was imputed using:
(1) the mean age difference between MEPS participants with certain family relationships (where available) or
(2) the mean age value for MEPS participants.