Volume 26, Number 3—March 2020
Research
US Tuberculosis Rates among Persons Born Outside the United States Compared with Rates in Their Countries of Birth, 2012–20161
, Adam J. Langer, J. Steve Kammerer, and Thomas R. Navin
Table 2
World Health Organization versus US TB IRRs, by years since entry into the United States before TB diagnosis*
| Year(s) since entry into the United States | Median IRR† |
|---|---|
| <1 | 0.5 |
| 1–4 | 4.0 |
| 5–9 | 6.7 |
| 10–14 | 6.9 |
| 15–19 | 11.0 |
| 20–24 | 11.1 |
| 25–29 | 10.9 |
| 30–34 | 7.2 |
| 35–39 | 7.1 |
| 40–44 | 9.3 |
| 45–49 | 5.5 |
| 50–54 | 6.7 |
| >55 | 4.9 |
*COB, country of birth; IRR, incidence rate ratio; TB, tuberculosis; WHO, World Health Organization.
†IRR is the rate in country (WHO rate, 2014) divided by the rate by COB by years since entry into the United States (US rate, 2012–2016). An IRR >1.0 indicates that the WHO rate is larger than the US rate. Median IRR for each year since entry into the United States category was calculated for the 195 countries defined by the United Nations Member State (https://www.un.org/en/member-states/index.html) and Non–Member States (https://www.un.org/en/sections/member-states/non-member-states/index.html) lists. A WHO rate and a nonzero US rate were available for only 189 of these countries.
1Preliminary results from this study were presented at the Union–North America Region conference, 2019 Feb 21–23, Vancouver, British Columbia, Canada; and at the National TB Conference, 2019 Apr 23–26, Atlanta, Georgia, USA.