Volume 12, Number 9—September 2006
Research
Periurban Trypanosoma cruzi–infected Triatoma infestans, Arequipa, Peru
Table 2
Determinants of population density of Triatoma infestans in animal enclosures in infested households of 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 | |||
Animal host | ||||||
Guinea pigs | 33.9 (1–343) | 2.25 (0.9–5.8) | 0.09 | 2.38 (1.0–5.7) | 0.05 | |
No animals present | 2.6 (1–7) | 0.08 (0.02–0.32) | <0.01 | 0.15 (0.04–0.57) | <0.01 | |
Chickens† | 28.2 (1–79) | 1.38 (0.23–8.4) | 0.70 | |||
Turkeys†‡ | 6.0 (1–15) | 0.18 (0.02–1.5) | 0.11 | |||
No. animals†§ | 1.0 (0.92–1.22) | 0.65 | ||||
Material | ||||||
Wire mesh only | 6.7 (1–10) | 0.21 (0.02–1.75) | 0.15 | 0.09 (0.01–0.6) | 0.02 | |
Unmortared basalt | 11.8 (1–109) | 0.38 (0.15–0.96) | 0.04 | 0.35 (0.15–0.80) | 0.01 | |
Mortared brick, basalt, and sillar only | 6.5 (3–15) | 0.20 (0.03–1.3) | 0.09 | 0.21 (0.04–1.1) | 0.06 | |
Unmortared brick† | 23.3 (1–90) | 1.13 (0.46–2.8) | 0.80 | |||
Adobe† | 21.0 (1–112) | 0.94 (0.22–4.0) | 0.94 | |||
Insecticide use† | 29.8 (1–112) | 1.1 (0.45–2.7) | 0.80 |
*Triatomine density was estimated by timed capture of insects by trained collectors. OR, odds ratio; CI, confidence interval.
†Dropped from the multivariate model.
‡1 turkey enclosure, which contained 598 T. infestans, was considered an outlier and left out of analysis.
§No mean is given for continuous variables.