1.6 Epidemiological indicators


When a National TB Programme (NTP) is functioning well, indicators from the local authorities and NTP can be obtained.

If not, the WHO developed a TB country profile sheet for each country1 where there are estimated TB incidences and prevalence, as well as, the HIV co-infection rate and estimated MDR-TB rates among new and previously treated TB cases.

The following are the most common indicators:

Annual incidence rate of all TB cases
Number of new cases of TB (all forms) that develop in a population of individuals during one year. The standard is to express it for 100,000 inhabitants.

Annual incidence rate of smear-positive TB cases
Number of new smear-positive cases of PTB that develop in a population of individuals during one year. The standard is to express it for 100,000 inhabitants.

Prevalence of smear-positive TB
Proportion of a population presenting with smear-positive TB at a specific time, usually one year, and reported per 100,000 population. Prevalence represents approximately double the incidence.

Proportion of MDR-TB among new and previously treated cases (Chapter 7).

HIV positivity rate among all TB patients
Proportion of HIV positive patients among all TB patients diagnosed during a given period of time.



Footnotes
Ref Notes
1 http://apps.who.int/iris/bitstream/10665/75938/1/9789241564502_eng.pdf