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Table 3 Selected best model for I. ricinus larvae infestation load on an individual bank vole with estimated coefficients (in log scale) explained by month (from May to October, with May as a reference), year (from 2012 to 2015, with 2012 as a reference), sex (female as a reference), body mass in grams (centred values), presence of I. trianguliceps females and nymphs, presence of I. ricinus nymphs, vole abundance during the same session, questing larvae in vegetation during the same session, the interaction between centred body mass and sex and the interaction between sex and vole abundance. We defined site and individual nested in site as nested random structure

From: Temporal dynamics of the tick Ixodes ricinus in northern Europe: epidemiological implications

 

Estimate (SE)

z-value

P-value

Intercept

-0.923 (0.318)

-2.91

0.004

June

0.477 (0.243)

1.96

0.050

July

-0.691 (0.277)

-2.49

0.013

August

-0.900 (0.342)

-2.63

0.009

September

-1.734 (0.413)

-4.20

<0.005

October

-2.768 (0.376)

-7.36

<0.005

2013

0.720 (0.150)

4.79

<0.005

2014

-0.688 (0.275)

-2.50

0.012

2015

-0.248 (0.169)

-1.47

0.142

Male

0.996 (0.219)

4.55

<0.005

Body mass

0.020 (0.010)

2.03

0.043

Presence of I. trianguliceps female

0.402 (0.154)

2.61

0.009

Presence of I. trianguliceps nymphs

0.202 (0.101)

2.00

0.046

Presence of I. ricinus nymphs

0.526 (0.132)

3.97

<0.005

Vole abundance

0.033 (0.005)

6.43

<0.005

Amount of questing larvae during the same session

0.027 (0.009)

2.86

0.004

Interaction: Sex(Male)*Body mass

0.048 (0.016)

3.02

0.003

Interaction: Sex (Male)*Vole abundance

-0.009 (0.003)

-3.20

0.001

Random effects

   

 Site

σ2 = 0.06 (SD = 0.25)

 Individual nested in site

σ2 = 0.22 (SD = 0.47)

Negative binomial dispersion parameter

1.70 (SE = 0.24)

  1. σ2 is the variance attributable to random effect. Number of observations: Total = 1007; Site = 4, Site:Individual = 658
  2. Abbreviations: SD standard deviation, SE standard error