Volume 17, Number 9—September 2011
Letter
Pulmonary Disease Associated with Nontuberculous Mycobacteria, Oregon, USA
, Cara D. Varley, Jill Ory, P. Maureen Cassidy, and Katrina Hedberg
Table
Prevalence of pulmonary nontuberculous mycobacterial disease, by geographic region and population density, Oregon, USA, 2005 and 2006*
| Region/population density | Prevalence† (95% confidence interval) |
|||
|---|---|---|---|---|
| Total no. cases | All age groups | Age <50 y | Age >50 y | |
| Total |
411 |
5.6 (5.0–6.1) |
1.1 (0.8–1.4) |
15.2 (13.6–16.9) |
| County-level analysis | ||||
| Western | 385 | 6.0 (5.4–6.6) | 1.2 (0.9–1.6) | 16.5 (14.8–18.4) |
| Metropolitan | 341 | 6.3 (5.7–7.0) | 1.3 (1.0–1.8)‡ | 18.0 (16.0–20.2)§¶# |
| Micropolitan | 39 | 4.5 (3.2–6.1) | 0.2 (0.0–1.0)‡ | 11.1 (7.8–15.2)§¶ |
| Rural | 5 | 3.6 (1.2–8.3) | 1.3 (0.0–7.1) | 6.5 (1.8–15.9)§# |
| Eastern | 26 | 2.7 (1.8–4.0) | 0.2 (0.0–0.9) | 7.6 (4.9–11.2) |
| Metropolitan | 9 | 3.0 (1.4–5.6) | 0.0 (0.0–1.8) | 8.6 (3.9–16.3) |
| Micropolitan | 12 | 2.5 (1.3–4.3) | 0.3 (0.0–1.7) | 6.8 (3.4–12.2) |
| Rural |
5 |
2.9 (1.0–6.8) |
0.0 (0.0–3.5) |
7.8 (2.5–18.2) |
| ZIP code** | ||||
| Western | 365 | 5.7 (5.2–6.4) | – | – |
| Urban | 277 | 6.4 (5.7–7.2)†† | – | – |
| Rural | 88 | 4.3 (3.5–5.3)†† | – | – |
| Eastern | 26 | 2.8 (1.8–4.0) | – | – |
| Urban | 5 | 2.7 (0.9–5.7) | – | – |
| Rural | 21 | 2.8 (1.7–4.1) | – | – |
*Annualized 2-year disease period prevalence, Oregon, 2005 and 2006.
†Cases per 100,000 population.
‡Significant differences (p<0.05) between western Oregon metropolitan and micropolitan counties, age <50 y.
§West, age >50 y, metropolitan, micropolitan, and rural (Cochran-Armitage test for trend, p<0.01).
¶Significant differences (p<0.05) between western Oregon metropolitan and micropolitan counties, age >50 y.
#Significant differences (p<0.05) between western Oregon metropolitan and rural counties, age >50 y.
**Included only the 391 patients for whom with ZIP code data were available. –, age-level data not available for ZIP codes.
††Significant differences (p<0.05) between western Oregon urban and rural ZIP codes.