WHO Global Task Force on TB Impact Measurement
What is TB impact measurement?
TB impact measurement has two major components. The first is measuring the epidemiological burden of TB, and trends in this burden, in terms of three so-called "impact indicators": incidence (the number of newly-arising cases of TB each year), prevalence (the number of cases of TB in the population at a given point in time) and mortality (the number of deaths from TB in a given year). These are the major indicators being used to measure progress in TB control at global level, for example in the context of targets set within the Millennium Development Goals (MDGs) and by WHO and the Stop TB Partnership. The second major component of TB impact measurement is evaluation of the extent to which interventions to control TB are responsible for changes in incidence, prevalence and mortality (so-called "impact evaluation").