3.Incidence and Prevalence Based Estimates of Tuberculosis Burden ( Impact Index )

(1) WHO recommends in its annual report using one (or more than one) of the following formulas for calculation of incidence: 1. Incidence＝cases notifications/proportion of cases detected 2. Incidence＝prevalence/duration of condition 3. Incidence＝annual risk of infection × Sty'blo coefficient 4. Incidence＝deaths/proportion of incident cases that die