Table 2.
Multimodel assessment of factors associated with T. cruzi infection in dogs born before residual spraying with insecticides of all houses in Pampa del Indio in 2008
| Model | df | Variables analyzed* | Model fit | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| (1) Age | (2) Infected bug abundance | (3) Ethnicity | (4) Origin | (5) Cohabiting with infected dogs/cats | (6) Oral infection risk | (7) Sex | (8) Domestic resting habit | Log likelihood | ΔAICi† | ωi | |||
| 1 | 1235 | 9 | X | X | X | – | X | – | – | – | −132.0 | 0.00 | 0.14 |
| 2 | 125 | 8 | X | X | – | – | X | – | – | – | −133.6 | 1.05 | 0.08 |
| 3 | 12357 | 10 | X | X | X | – | X | – | X | – | −131.8 | 1.76 | 0.06 |
| 4 | 12358 | 10 | X | X | X | – | X | – | – | X | −132.0 | 2.09 | 0.05 |
| 5 | 12356 | 10 | X | X | X | – | X | X | – | – | −132.0 | 2.14 | 0.05 |
| 6 | 1257 | 9 | X | X | – | – | X | – | X | – | −133.1 | 2.17 | 0.05 |
| 7 | 12345 | 11 | X | X | X | X | X | – | – | – | −131.0 | 2.19 | 0.05 |
| 8 | 1245 | 10 | X | X | – | X | X | – | – | – | −132.3 | 2.74 | 0.04 |
| 9 | 1258 | 9 | X | X | – | – | X | – | – | X | −133.5 | 3.02 | 0.03 |
| 10 | 1256 | 9 | X | X | – | – | X | X | – | – | −133.5 | 3.07 | 0.03 |
| 11 | 12457 | 11 | X | X | – | X | X | – | X | – | −131.6 | 3.44 | 0.03 |
| 12 | 123457 | 12 | X | X | X | X | X | – | X | – | −130.6 | 3.67 | 0.02 |
| 13 | 123578 | 11 | X | X | X | – | X | – | X | X | −131.8 | 3.86 | 0.02 |
| 14 | 123567 | 11 | X | X | X | – | X | X | X | – | −131.8 | 3.92 | 0.02 |
| 15 | 12578 | 10 | X | X | – | – | X | – | X | X | −133.0 | 4.18 | 0.02 |
| RI | 1.00 | 0.91 | 0.57 | 0.32 | 0.94 | 0.26 | 0.34 | 0.27 | |||||
ΔAICci = AICci − AICcmin. ωi = exp(−1/2 ΔAICci)/Σ exp (−1/2 ΔAICci). X = variable included in the model; – = variable not included in the model.
*
Variables (detailed in the text): age, reconstructed age (months), infected bug abundance (four levels), ethnicity, ethnic background of the animal's household (Toba or Creole), origin (three levels), number of T. cruzi-infected dogs or cats with which the animal cohabited (three levels), oral infection risk, sex, and whether the dog rested in domiciles, kitchens, or storerooms (two levels).
†
Lowest AICc = 282.66.