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Volume 11, Number 8—August 2005

Research

Sheep Feed and Scrapie, France

Sandrine Philippe*, Christian Ducrot†, Pascal Roy‡, Laurent Remontet‡, Nathalie Jarrige*, and Didier Calavas*Comments to Author 
Author affiliations: *Agence Française de Sécurité Sanitaire des Aliments, Lyon, France; †Institut National de la Recherche Agronomique, Theix, France; ‡Centre Hospitalo-Universitaire Lyon-Sud, Lyon, France

Main Article

Table 2

Multivariate analysis of potential confounding factors

Factors Modalities* No. controls (%) No. cases (%) Log-linear model
OR† 95% CI
Flock size <133* 100 (29) 11 (12) 1.0
133–236 87 (25) 24 (25) 2.5 1.1 – 5.5
237–366 77 (22) 33 (35) 4.0 1.8 – 8.6
>366 86 (25) 26 (28) 3.0 1.3 – 7.0
Type of flock Dairy* 229 (65) 64 (68) 1.0
Meat 113 (32) 27 (29) 1.0 0.3 – 3.2
Mixed 8 (2) 3 (3) 1.2 0.3 – 5.5
Intensification criteria None* 241 (69) 56 (60) 1.0
Production monitoring 38 (11) 16 (17) 1.8 0.8 – 3.8
Involvement in a breeding scheme 71 (20) 22 (23) 1.1 0.6 – 2.1

*Reference modality.
†OR, odds ratio; CI, confidence interval.

Main Article

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