Table 1.
Univariate logistic regression analysis of factors associated with Orientia infection among 153 rodents captured on Chiloé Island
| Risk factor | N | Orientia infection | ||||
|---|---|---|---|---|---|---|
| n | % | 95% CI | Odds ratio | P-value | ||
| Study site | ||||||
| No. 6 | 19 | 3 | 15.8 | 5.7–37.9 | 1.00 | |
| No. 5 | 53 | 6 | 11.3 | 5.4–22.6 | 0.68 | 0.615 |
| No. 4 | 28 | 13 | 46.4 | 29.5–64.3 | 4.62 | 0.037* |
| No. 3 | 25 | 10 | 40.0 | 23.4–59.4 | 3.56 | 0.091 |
| No. 2 | 23 | 6 | 26.1 | 12.6–47.1 | 1.88 | 0.422 |
| No. 1 | 5 | 0 | 0.0 | 0.0–45.9 | NA | 0.989 |
| Rodent species | ||||||
| Abrothrix olivacea | 110 | 31 | 28.2 | 20.6–37.2 | 1.00 | |
| Irenomys tarsalis | 23 | 5 | 21.7 | 9.8–42.2 | 0.71 | 0.529 |
| Geoxus valdivianus | 6 | 0 | 0.0 | 0.0–41.0 | NA | 0.992 |
| Rattus norvegicus | 2 | 1 | 50.0 | 9.4–90.6 | 2.55 | 0.513 |
| Abrothrix sanborni | 7 | 1 | 14.3 | 3.2–52.7 | 0.42 | 0.437 |
| Loxodontomys micropus | 2 | 0 | 0.0 | 0.0–70.8 | NA | 0.995 |
| Oligoryzomys longicaudatus | 1 | 0 | 0.0 | 0.0–84.2 | NA | 0.997 |
| Missing data | 2 | 0 | 0.0 | |||
| Rodent sex | ||||||
| Female | 21 | 5 | 23.8 | 10.7–45.4 | 1.00 | |
| Male | 132 | 33 | 25.0 | 18.4–33.0 | 1.07 | 0.882 |
| Rodent age | ||||||
| Juvenile | 89 | 22 | 24.7 | 16.9–34.6 | 1.00 | |
| Adult | 64 | 16 | 25.0 | 16.0–36.9 | 1.02 | 0.968 |
| Mite infestationa | ||||||
| Without | 60 | 15 | 25.0 | 15.8–37.3 | 1.00 | |
| Any trombiculid | 93 | 23 | 24.7 | 17.1–34.4 | 0.99 | 0.970 |