TABLE 3.
Results from univariate and multivariate Cox proportional hazard models on 42 dogs that were seropositive for Trypanosoma cruzi evaluated at a veterinary medical teaching hospital
| Univariate | Multivariate | |||||
|---|---|---|---|---|---|---|
| Variable | Hazard ratio | 95% confidence interval of the hazard ratio | P‐value (Likelihood ratio test) | Hazard ratio | 95% confidence interval of the hazard ratio | P‐value |
| Weight (kg) | 1.02 | 1.00‐1.05 | .07 | 1.03 | 1.0‐1.1 | .04 |
| Age at presentation (years) | 0.99 | 0.88‐1.12 | .9 | |||
| LA : Ao (0.01 unit increment) | 3.77 | 1.17‐12.14 | .04 | |||
| LVIDdN (0.01 unit increment) | 2.06 | 0.47‐9.00 | .4 | |||
| LVIDsN (0.01 unit increment) | 2.34 | 0.67‐8.17 | .2 | |||
| FS (%, 1 unit increment) | 0.08 | 0.94‐1.02 | .3 | |||
| EF (%, 1 unit increment) | 0.99 | 0.96‐1.03 | .6 | |||
| RA:LA (enlargement) | 0.97 | 0.21‐4.53 | 1 | |||
| Sex (male) | 0.82 | 0.33‐2.03 | .7 | |||
| Troponin (>1 ng/mL) | 0.83 | 0.26‐2.64 | .7 | |||
| Modified Lown score (≥2) | 3.08 | 1.15‐8.21 | .04 | |||
| QRS duration (>0.07 ms) | 2.45 | 0.85‐7.01 | .1 | |||
| AVB (presence) | 2.50 | 1.00‐6.24 | .05 | |||
| RV (enlargement) | 3.39 | 1.35‐8.48 | .01 | 3.6 | 1.4‐9.3 | .007 |
Abbreviations: AVB, atrioventricular block; EF, ejection fraction; FS, fractional shortening; LA : Ao, ratio of the left atrial diameter to the aortic valve diameter; LVIDdN, left ventricular internal dimension at end‐diastole normalized to body weight; LVIDsN, left ventricular internal dimension at end‐systole normalized to body weight; RA : LA, ratio of the right atrial diameter to the left atrial diameter; RV, right ventricle.