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. 2002 Aug;8(8):777–782. doi: 10.3201/eid0808.010486

Table 5. Immunoglobulin G anti-West Nile virus prevalence in equines, by age, sex, breed, and group size, Camargue, France, 2000.

Variable OR estimatea 95% CI
Age (years)
<1 Ref
1–2 1.83 0.42 to7.99
3–5 1.39 0.32 to 5.98
6–10 1.13 0.26 to 4.86
11–15 1.25 0.29 to 5.41
16–20 1.24 0.28 to 5.43
21–25 1.20 0.26 to 5.48
>25 1.24 0.25 to 6.15
Sex
Mare Ref.
Gelding 1.13 0.89 to 1.45
Stallion 1.18 0.88 to 1.58
Breed
Pure breeds 1.30 0.97 to 1.74
Camargue 1.40 1.08 to 1.82
Ponies 1.15 0.77 to 1.72
Other Ref.
Group size
1–2 2.18 1.60 to 2.96
3–6 1.81 1.31 to 2.52
7–25 1.09 0.77 to 1.53
>25 Ref.

aOR, odds ratio; 95% CI, 95% confidence intervals.