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Volume 17, Number 9—September 2011

Letter

Pulmonary Disease Associated with Nontuberculous Mycobacteria, Oregon, USA

Kevin L. WinthropComments to Author , Cara D. Varley, Jill Ory, P. Maureen Cassidy, and Katrina Hedberg
Author affiliations: Author affiliations: Oregon Health and Sciences University, Portland, Oregon, USA (K.L. Winthrop, C.D. Varley); Oregon Public Health Division, Portland (K.L. Winthrop, P.M. Cassidy, K. Hedberg); Ory Consulting, Portland (J. Ory)

Main Article

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.

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