Bulletin of the World Health Organization

Prevalence of tuberculous infection and incidence of tuberculosis; a re-assessment of the Styblo rule

F van Leth, MJ van der Werf, MW Borgdorff

Volume 86, Number 1, January 2008, 20-26

Table 2. Number of tuberculous infections and smear-positive TB cases per 100 000 population, by country and yeara

Country Yeara Infections Smear-positive TB Infection-to-disease ratio 95% CI of ratio
Republic of Korea7,8 1975 1780 480 3.7 2.9–4.5
1980 1240 310 4.0 2.7–5.3
1985 1120 240 4.7 3.5–5.9
1990 60 144 3.2 1.6–4.8
China9 1979 640 187 3.4 Not doneb
1985 590 156 3.8 Not doneb
China10 1990 638 134 4.8 Not doneb
1996 700 121 5.8 Not doneb
Philippines11 1982 2480 950 2.6 Not doneb
1994 2300 525 4.4 3.9–4.9

CI, confidence interval; TB, tuberculosis; TST, tuberculin skin test.a The year for the number of infections is derived from the midpoint between the birth of the cohort and the year of the actual tuberculin survey.b Not done due to missing information of denominator in TST survey.

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