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 1. Original data as reported by Styblo⁵

Source	Period	Disease parameter	ARTI (%)	Ratio between ARTI (%) and
Source	Period	Disease parameter	ARTI (%)	mortality^a	incidence^a	prevalence^a
Netherlands	1921–1928	Mortality	2.7–6.0	19	38	–
Netherlands	1951–1976	Incidence	0.038–0.4	–	37	–
Developing countries	1956–1961	Prevalence	2.0–8.0	–	40–60	80–120
Alaska	1948–1951	Mortality	25	26	52	–
India	1961–1968	Prevalence	1.5	–	53	106
India	1969–1971	Prevalence	4.1	–	51	102

ARTI, annual risk of tuberculous infection.^a per 100 000 population.The bold figures indicate data from source documents used by Styblo; the other figures are the estimates that Styblo derived using his assumptions.

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

Table 1. Original data as reported by Styblo5

Table 1. Original data as reported by Styblo⁵