Table 4.
Exponentiated beta (β) coefficients are shown for the multivariate linear model of log10-transformed TDCIPP concentrations with household variables. Covariates include sampling season, adoption year, and whether the cat spent any time outdoors. The model was constructed using a stepwise variable selection procedure based on Akaike information criterion optimization.
| Variable | 10β | 95% CI | p-value |
|---|---|---|---|
| Household Cleaning |
|||
| Air freshener use | |||
| Never | Reference | ||
| Annual | 0.653 | 0.330, 1.29 | 0.223 |
| Seasonal | 1.46 | 0.980, 2.19 | 0.066* |
| Monthly | 1.97 | 1.22, 3.18 | 0.007** |
| Weekly+ | 1.61 | 1.18, 2.20 | 0.004** |
| Vacuum frequency | |||
| 0 times/month | Reference | ||
| 1–4 times/month | 1.21 | 0.778, 1.88 | 0.402 |
| 5–8 times/month | 0.982 | 0.607, 1.59 | 0.942 |
| 9+ times/month | 1.06 | 0.646, 1.74 | 0.821 |
| Residence |
|||
| Number of people | 1.10 | 0.989, 1.22 | 0.085* |
| Residence built | |||
| Prior to 1989 | Reference | ||
| 1990–2004 | 1.25 | 0.888, 1.76 | 0.203 |
| 2005 to Present | 2.05 | 1.34, 3.13 | 0.001** |
| Last purchase of upholstered furniture | |||
| Prior to 2006 | Reference | ||
| 2007–2012 | 2.14 | 1.26, 3.62 | 0.006** |
| 2013-Present | 1.19 | 0.718, 1.97 | 0.499 |
| Feline Behaviors |
|||
| Any consumption of commercial dry food | 2.77 | 1.71, 4.49 | <0.001** |
| Preferred location in residence | |||
| No preference | Reference | ||
| Carpet/rug | 0.590 | 0.265, 1.31 | 0.198 |
| Cat bed/perch | 0.849 | 0.645, 1.12 | 0.247 |
| Furniture | 1.45 | 1.02, 2.05 | 0.040** |
| Human bed | 1.40 | 0.892, 2.21 | 0.146 |
Bold *:
p<0.10;
Bold **:
p<0.05