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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*†Comments to Author , Neil White*†, Clas Ahlm†, Fredrik Elgh†‡§, Ann-Christin Verlemyr†, Per Juto†, and R. Thomas Palo*†
Author affiliations: *Swedish University of Agricultural Sciences, Umeå, Sweden; †Umeå University, Umeå, Sweden; ‡Defense Research Agency, Umeå, Sweden; §Swedish Institute for Infectious Disease Control, Solna, Sweden;

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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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