Comparability
Changes in reasons for having an HIV or AIDS test change across survey years. The inclusion of other response categories (e.g., pregnancy in 1997-1999) affect the comparability of ATRNYOTH1 over time.
Changes in survey design (e.g. quarters or subsamples) affect raw frequencies but do not affect comparability between samples. As always, data users should apply prescribed IPUMS NHIS weights.
