Volume 15, Number 5—May 2009
Research
A Case–Control Study on the Origin of Atypical Scrapie in Sheep, France
Alexandre Fediaevsky
, Eric Morignat, Christian Ducrot, and Didier Calavas
, Eric Morignat, Christian Ducrot, and Didier Calavas
Table 6
Multivariate analyses coefficient parameters of the final model for atypical scrapie in sheep, France*
| Variable | Coefficient (β) | Standard error (β) | p value† |
|---|---|---|---|
| Random coefficient | 0 | 2.00 × 10–5 | |
| Intercept | −1.51 | 0.24 | 2 × 10–10 |
| No. animals tested during 2002–2006 | 0.04 | 0.01 | 6 × 10–10 |
| Sheep dairy farm | 2.71 | 0.78 | 2 × 10–5 |
| Organic farm | −1.88 | 1.08 | 0.03 |
| Corn silage in C0 | −1.81 | 0.59 | 5 × 10–4 |
| Vitamin and mineral supplements in C0 | −0.51 | 0.33 | 0.02 |
| Interaction term between sheep dairy farm and vitamin and mineral supplements in C0 | −1.69 | 0.88 | 0.04 |
*For categorical variables, the reference value was no. C0, birth cohort assuming that in each flock all animals born during the same birth campaign (defined from July 1 of year n – 1 to June 30 of year n) shared the same exposure.
†By log likelihood ratio test.
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