Comparability
Slight changes in response categories may affect comparability over time for ATNOMAIN. Beginning in 2001 the categories "don't like needles" and "afraid of losing job if positive for AIDS" were added. However, beginning in 2004, "afraid of losing job if positive for AIDS" was expanded to "afraid of losing job, insurance, housing, friends, family" if people knew about positive AIDS infection status. Otherwise there are no comparability issues.
