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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 2

Outcome of the binary logistic regression models I and II predictions of risk of a bank vole’s being seropositive for Puumula virus under specified conditions in relation to reference levels a–f

Model I
Model II
Predictor Coeff. Zg ph OR 95% CI Coeff. Z p OR 95% CI
Agea
2 1.71 4.69 <0.001 5.55 2.71 to 11.36 1.74 4.76 <0.001 5.67 2.78 to 11.6
3 1.43 5.03 <0.001 4.18 2.39 to 7.3 1.39 5.03 <0.001 4.01 2.33 to 6.89
4 3.41 6.73 <0.001 30.27 11.22 to 81.7 3.36 6.69 <0.001 28.7 10.7 to 76.6
Genderb
Male 0.61 2.72 0.007 1.84 1.19 to 2.87 0.62 2.78 0.005 1.87 1.2 to 2.9
BMIc 1.39 3.43 0.001 4.03 1.82 to 8.94 1.41 3.48 <0.001 4.1 1.85 to 9.07
Phased
Peak 0.88 2.57 0.01 2.4 1.23 to 4.7 0.87 2.58 0.01 2.4 1.23 to 4.65
Increase –1.03 –2.07 0.04 0.36 0.13 to 0.95 –1.03 –2.1 0.04 0.36 0.14 to 0.93
Typee
Case site 0.10 0.48 0.63 1.11 0.73 to 1.69
Pairf
Center 0.17 0.67 0.50 1.19 0.72 to 1.95
North
0.21
0.88
0.38
1.24
0.77 to 2.0





aThe age class with the largest number of individuals was set as reference with which all others were compared, i.e., age class 1 (juveniles and subadults).
bFemale bank voles were set as reference.
cBody mass index (BMI) is a continuous variable; OR refers to unit increase.
dThe decline/low population phase was used as reference.
eThe sampling area type “random forest site” was set as reference.
fSouth sampling pair was reference to other pairs on regional effect.
gThe Z-score shows the number of standard deviations that the tested predictor class’s coefficient falls above or below the predictor’s reference level.
hThe p value is the probability that the observed coefficient of the actual predictor class’s should be by random chance variation.
Coeff., coefficient; OR, odds ratio; CI, confidence interval.

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