Tuberculosis in Norway by country of birth, 1986–1999
METHOD: The expected number of TB cases was calculated by applying the sex- and age-specific incidence rates for those born in Norway to the corresponding foreign-born population. The SIR was measured as the ratio between observed and expected number of cases.
RESULTS: The expected number of TB cases was between zero and three for all selected countries; the observed number of cases was significantly higher. The SIR was highest for Africa (160, 95%CI 144–175) and lowest for USA/Canada (0.4, 95%CI 0.1–1.0). It was 883 for Somalia (95%CI 775–991), 122 for Vietnam (95%CI 106–139), 119 for Pakistan (95%CI 105–134), 115 for the Philippines (95%CI 91–144) and 49 for former Yugoslavia (95%CI 40–57). The SIR for all the foreign-born was 21 (95%CI 20–22), giving a population attributable risk of 38%. It was highest in the age group 15–39 years (95, 95%CI 89–101), and lowest for those 65 years and older (3, 95%CI 2.1–3.3). The SIR for extra-pulmonary TB was also high in those aged 15–39 years (159, 95%CI 146–173).
CONCLUSION: SIRs for TB differ by country and continent of birth. Understanding local epidemiology and immigration patterns will help better target prevention efforts.
Document Type: Regular Paper
Affiliations: 1: Divisions of Infectious Disease Control and Epidemiology, Norwegian Institute of Public Health, Oslo, Norway and Department of International Health, Institute of General Practice and Community Medicine, Faculty of Medicine, University of Oslo, Oslo, Norway 2: Divisions of Infectious Disease Control and Epidemiology, Norwegian Institute of Public Health, Oslo, Norway 3: Department of International Health, Institute of General Practice and Community Medicine, Faculty of Medicine, University of Oslo, Oslo, Norway
Publication date: 01 March 2003
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