Comparability
There is a break in response categories offered between 2000 and 2001-forward that may affect comparability. The 2000 categories of "part of a routine medical check-up" and "medical procedures/hospitalization" were combined into a single category beginning in 2001. After 2000, the categories "It was required" and "Work/employment" were no longer included. From 2001-forward this variable is completely comparable.
