SAGE validation sub-studies
Chronic health conditions: assessing self-report against a gold standard diagnostic test
Two countries, India and Mexico, will implement a sub-study comparing self-report of eight health conditions included in SAGE to results from gold standard diagnostic tests in the same individuals. The SAGE interview questions will be used to determine a set of positive (cases) and negative (controls) to undergo clinical testing to determine sensitivity, specificity, and positive and negative predictive values of the self-report and symptom questions asked in the interview. This sub-study will be implemented in 2013/14.