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Volume 8, Number 9—September 2002
Research
Demographic Factors Associated with Hantavirus Infection in Bank Voles (Clethrionomys glareolus)
Gert E. Olsson*†
, Neil White*†, Clas Ahlm†, Fredrik Elgh†‡§, Ann-Christin Verlemyr†, Per Juto†, and R. Thomas Palo*†
, Neil White*†, Clas Ahlm†, Fredrik Elgh†‡§, Ann-Christin Verlemyr†, Per Juto†, and R. Thomas Palo*†
Table 1
Binary logistic regression variables included in the model that predicted the probability of a bank vole’s being seropositive to Puumala virus (PUUV)
| Variable | Variable description | Nominal reference level |
|---|---|---|
| Serostatus | Binary response variable, bank voles with PUUV-specific immunoglobulin G antibodies are denoted “1” (“success”) and seronegative bank voles “0” (“failure”) | |
| Age | Polytomous independent variable, age classes; 1=juvenile/subadult <3 months of age; 2 = adult born in year of sampling 3–6 months of age; 3 = overwintered adult in spring >7 months of age; 4 = overwintered adult in fall >11 months of age | Age class 1 |
| Sex | Dichotomous independent variable for female or male | Females |
| BMI | Continuous variable body mass index | |
| Phase | Polytomous independent variable on population phase denoted as increase (1997), peak (1998), or decline/low (1999) | Decline/low |
| Type | Dichotomous independent variable: case site or random forest site | Random forest site |
| Pair | Polytomous variable on paired case- and random forest sites located south, center, or north within sampling region | South |
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