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*
Table 3
Multivariate analysis of risk factors
| Modalities* | No. cases (%) | No. controls (%) | Multivariate Clog-log 1 |
Multivariate Clog-log 2 |
|||
|---|---|---|---|---|---|---|---|
| OR† | 95% CI | OR | 95% CI | ||||
| Direct contacts between flocks and indirect environmental contacts | |||||||
| Purchase of ewes | No | 39 (41) | 123 (35) | 1 | – | 1 | – |
| Yes | 1.3 | 0.9–2.0 | 1.3 | 0.8–2.0 | |||
| Feeding | |||||||
| Purchase of raw materials (hay excluded) | No | 28 (30) | 137 (39) | 1 | – | 1 | – |
| Yes | 0.6 | 0.4–1.0 | 0.7 | 0.4–1.0 | |||
| Purchase of milk replacers | No | 28 (30) | 63 (18) | 1 | – | ||
| Yes | 1.9 | 1.2–3.0 | NI | ||||
| Purchase of proprietary concentrates | No | 87 (93) | 271 (77) | 1 | – | ||
| Yes | 1.5 | 0.7–3.4 | NI | ||||
| Purchase of milk replacers from factory 1 | No | 18 (19) | 21 (6) | 1 | – | ||
| Yes | NI | 1.9 | 1.0–3.5 | ||||
| Purchase of proprietary concentrates from factory 1 | No | 46 (49) | 79 (23) | 1 | – | ||
| Yes | NI | 2.0 | 1.2–3.3 | ||||
| Purchase of proprietary concentrates from factory 2 | No | 9 (10) | 58 (17) | 1 | – | ||
| Yes | NI | 0.7 | 0.3–1.5 | ||||
| Other indirect contacts | |||||||
| Cesarean section performed by veterinarian | No | 66 (70) | 187 (53) | 1 | – | 1 | – |
| Yes | 1.6 | 0.9–2.8 | 1.4 | 0.8–2.5 | |||
*Reference modality = No.
†OR, odds ratio; CI, confidence interval; NI, not in model.
