Case or Control
Matched Group Number
Asthma, Any Severity
Asthma severity
High-Risk HIV Infection
High-Risk Sickle Cell Disease
High-Risk Cardiac Disease
Cancer/Immunosuppressant Use (non-HIV)
High-Risk Renal/Hepatic Disease
High-Risk Diabetes Mellitus
High-Risk Alcohol Abuse
High-Risk Tobacco Use
Pulmonary Disease, Non-Asthma
Male Gender
Black Race
INT(STUDNUM/100)=VOLUNTEER
Race
Gender