. 2010 Feb;10(2):93–102. doi: 10.1016/S1473-3099(09)70326-3

Table 1.

Tuberculosis prevalence and the number needed to screen to identify one new case in different target groups

	Number of studies	Regions represented	Median prevalence of newly diagnosed tuberculosis (range)	Median number needed to screen (range)
Congregate settings (all)²¹^,²²^,²³^,²⁴^,²⁵^,²⁶^,²⁷^,²⁸^,²⁹^,³⁰^,³¹^,³²^,³³^,³⁴^,³⁵^,³⁶^,³⁷^,³⁸^,³⁹^,⁴⁰^,⁴¹^,⁴²^,⁴³^,⁴⁴^,⁴⁵^,⁴⁶^,⁴⁷^,⁴⁸^,⁴⁹^,⁵⁰	30	Africa, Asia, the Americas	2·2% (0·1–7·2)	45 (14–833)
Congregate settings (prisons)²¹^,²²^,²³^,²⁴^,²⁵^,²⁶^,²⁷^,²⁸^,²⁹^,³⁰^,³¹^,³²^,³³^,³⁴^,³⁵^,³⁶^,³⁷^,³⁸^,³⁹^,⁴⁰^,⁴¹	21	Africa, Asia, the Americas	2·5% (0·1–7·2)	40 (14–833)
Congregate settings (prisons)²⁷^,²⁸^,²⁹^,³⁰^,³¹^,³²^,³³	7	Sub-Saharan Africa	3·6% (1·8–7·2)	28 (14–55)
Congregate settings (mines)⁴³^,⁴⁴^,⁴⁵^,⁴⁶^,⁴⁷^,⁴⁸	6	Africa, Asia	2·3% (1·2–5·0)	43 (20–86)
Voluntary counselling and testing services⁵¹^,⁵²^,⁵³^,⁵⁴^,⁵⁵^,⁵⁶^,⁵⁷^,⁵⁸^,⁵⁹^,⁶⁰^,⁶¹	10	Africa, Asia, the Americas	8·5% (0·8–23·6)	12 (4–123)
Prevention of mother-to-child transmission services⁶²^,⁶³^,⁶⁴	3	Africa, Asia	2·3% (2·1–3·5)	44 (29–47)
Antiretroviral therapy and medical clinics⁹^,¹⁰^,⁶⁵^,⁶⁶^,⁶⁷^,⁶⁸^,⁶⁹^,⁷⁰^,⁷¹^,⁷²^,⁷³^,⁷⁴^,⁷⁵^,⁷⁶^,⁷⁷^,⁷⁸^,⁷⁹^,⁸⁰^,⁸¹	16	Africa, Asia, the Americas	8·2% (1·4–24·7)	12 (4–71)
Antiretroviral therapy and medical clinics⁹^,¹⁰^,⁷⁰^,⁷¹^,⁷²^,⁷³^,⁷⁴^,⁷⁵^,⁷⁶^,⁷⁷	8	Sub-Saharan Africa	8·6% (3·6–24·7)	12 (4–28)
Contact tracing⁸²^,⁸³^,⁸⁴^,⁸⁵^,⁸⁶^,⁸⁷^,⁸⁸^,⁸⁹^,⁹⁰^,⁹¹	10	Africa, Asia, the Americas	2·2% (0·01–14·5)	45 (7–10 000)
Population-based surveys¹¹^,⁹²^,⁹³^,⁹⁴^,⁹⁵^,⁹⁶^,⁹⁷^,⁹⁸^,⁹⁹	8	Sub-Saharan Africa	0·7% (0·02–3·5)	148 (29–5000)