Table 2.
Distribution and results of the univariate analysis for the environmental explanatory variables calculated in buffers of 2 km-radius around each stable and tested for their association with the serological status of WNV in equids in Southern France, 2007–2008.
| Variable | Mean (Min; Max) | Adjusted Odds-Ratio | 95% Confidence Interval | p-value |
|---|---|---|---|---|
| Mean percentage (%) of open water area a: | ||||
| NOT | 5.025 (0.0; 52.70) | 2.07 | [1.47–2.92] | <0.001 |
| END | 4.962 (0.0; 50.83) | 2.16 | [1.53–3.05] | <0.001 |
| EPI | 4.083 (0.0; 50.67) | 1.91 | [1.35–2.7] | <0.001 |
| Mean % of flooded vegetation area a: | ||||
| NOT | 8.831 (0.88; 31.84) | 2.96 | [1.46–6.02] | 0.003 |
| END | 8.170 (0.09; 35.98) | 3.35 | [1.94–5.79] | <0.001 |
| EPI | 21.612 (1.06; 64.61) | 2.44 | [1.42–4.2] | 0.001 |
| Differences in mean % of open water area (e.g.,: NOT-END = mean% NOT − mean% END) : | ||||
| NOT-END | 0.064 (−3.70; 3.88) | |||
| [−3.70; 0.01] | NS | [0.29–0.83] | 0.008 | |
| [0.01; 0.14] | 0.49 | |||
| [0.14; 3.88] | NS | |||
| END-EPI | 0.878 (−1.03; 8.01) | |||
| [−1.03; 0.0] | NS | |||
| [0.0; 0.88] | NS | |||
| [0.88; 8.01] | 3.83 | [1.71–8.56] | 0.001 | |
| NOT-EPI | 0.943 (−1.73; 10.50) | |||
| [−1.73; 0.04] | NS | |||
| [0.04; 0.78] | NS | |||
| [0.78; 10.50] | 2.15 | [1.35–3.43] | 0.001 | |
| Differences in mean % of flooded vegetation area: | ||||
| NOT-END | 0.661 (−13.15; 11.92) | |||
| [−13.15; −0.08] | NS | [0.38–0.9] | 0.015 | |
| [−0.08; 2.88] | 0.59 | |||
| [2.88; 11.92] | NS | |||
| END-EPI | −13.440 (−46.43; −1.06) | |||
| [−46.43; −17.55] | NS | |||
| [−17.55; −5.11] | 0.49 | [0.31–0.79] | 0.003 | |
| [−5.11; −1.06] | 0.58 | [0.38–0.88] | 0.011 | |
| NOT-EPI | −5.747 (−48.01; 3.97) | |||
| [−48.01; −16.97] | NS | |||
| [−16.97; −2.34] | NS | |||
| [−2.34; 3.97] | 0.45 | [0.27–0.76] | 0.003 | |
a before log-transformation.