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Tuberculosis in Norway by country of birth, 1986-1999
Objective:
To estimate the standardised incidence ratio (SIR) of TB among the foreign-born in Norway.
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 extrapulmonary 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.
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