Definition
HIV level. The InterVA-4 “high” HIV/AIDS setting (value='H') was used for sites in Kenya, Malawi and South Africa. All other sites used the “low” setting (value='L'); the “very low” setting was not used. The InterVA-4 guideline is that the “high” setting is appropriate for an expected HIV/AIDS cause-specific mortality fraction (CSMF) higher than about 1%, though it does not result in any great dichotomisation of outputs; the clinical equivalent is a physician’s knowledge that his/her current case comes from a setting where HIV/AIDS is more or less likely, irrespective of that current case’s particular symptoms.