Volume 8, Number 7—July 2002
Research
Persistent High Incidence of Tuberculosis in Immigrants in a Low-Incidence Country
Troels Lillebaek*
, Åse B. Andersen†, Asger Dirksen‡, Else Smith*, Lene T. Skovgaard§, and Axel Kok-Jensen‡
, Åse B. Andersen†, Asger Dirksen‡, Else Smith*, Lene T. Skovgaard§, and Axel Kok-Jensen‡
Table 3
Risk for tuberculosis (TB) related to duration of residence in Denmark for Somali immigrants, 1995–1999
| Average residencea (yrs) | Person-observation years | Reported TB cases |
||
|---|---|---|---|---|
| no. | Incidence % (no. in % of yrs) (95% CI)b | Cumulated annual incidence (%) | ||
| 1/2b | 4,788b | 97 | 2.0 (1.7 to 2.5) | 1.0b |
| 1 | 9,746 | 158 | 1.6 (1.4 to 1.9) | 2.6 |
| 2 | 9,876 | 131 | 1.3 (1.1 to 1.6) | 3.9 |
| 3 | 8,490 | 95 | 1.1 (0.9 to 1.4) | 5.0 |
| 4 | 5,696 | 63 | 1.1 (0.9 to 1.4) | 6.1 |
| 5 | 3,885 | 45 | 1.2 (0.9 to 1.6) | 7.3 |
| 6 | 2,394 | 17 | 0.7 (0.4 to 1.2) | 8.0 |
| 7 | 842 | 13 | 1.5 (0.9 to 2.7) | 9.5 |
aAverage duration of residence in Denmark
bPerson-observation years and cumulated incidence only “counts half” in year after arrival (see Methods); 95% CI, 95% confidence interval.
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