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Volume 12, Number 9—September 2006


Periurban Trypanosoma cruzi–infected Triatoma infestans, Arequipa, Peru

Michael Z. Levy*†‡Comments to Author , Natalie M. Bowman‡, Vivian Kawai‡, Lance A. Waller†, Juan Cornejo del Carpio§, Eleazar Cordova Benzaquen¶, Robert H. Gilman‡#, and Caryn Bern*
Author affiliations: *Centers for Disease Control and Prevention, Atlanta, Georgia, USA; †Emory University, Atlanta, Georgia, USA; ‡Asociación Benéfica Proyectos en Informática, Salud, Medicina y Agricultura, Lima, Peru; §Dirección Regional del Ministerio de Salud, Arequipa, Peru; ¶Universidad Nacional San Agustín, Arequipa, Peru; #Johns Hopkins University, Baltimore, Maryland, USA

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Table 4

Determinants of population density of Triatoma infestans in rooms of human dwellings in a periurban community of Arequipa, Peru*

Risk factor Mean no. triatomines captured (range) Univariate zero-truncated negative binomial regression
Multivariate zero-truncated negative binomial regression
Ratio (95% CI) p value Adjusted ratio (95% CI) p value
Each person sleeping in room† 1.58 (1.29–1.93) <0.001 1.42 (1.16–1.72) 0.001
Animal sleeping in room 22.12 (1–124) 7.34 (2.20–24.54) 0.001 5.23 (1.56–17.47) 0.007
Fully stuccoed walls and ceiling 3.03 (1–20) 0.065 (0.03–0.16) <0.001 0.11 (0.04–0.31) <0.001
Adobe 1.73 (1–4) 0.055 (0.013–0.24) <0.001 0.15 (0.032–0.73) 0.019
Mortared brick, sillar, or basalt 12.62 (1–124) 2.25 (1.08–4.71) 0.03 0.80 (0.35–1.84) 0.599‡
Unmortared brick, sillar, or basalt§ 11.85 (1–103) 1.58 (0.65–3.87) 0.313
Insecticide use§ 9.74 (1–124) 1.20 (0.32–2.44) 0.808

*Triatomine density was estimated by timed-capture of insects by trained collectors. CI, confidence interval.
†No mean is given for continuous variables.
‡The variable describing mortared brick, sillar, and basalt was left in the final model because it represents a possible intervention and was therefore a principal variable of interest. Removing the variable does not greatly affect the estimates for the other parameters or the significance level of those estimates.
§Dropped from the multivariate model.

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