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 2
Univariate analyses of farm structure variables conditional to C0 for atypical scrapie in sheep, France*
| Variable | Controls | Cases | Odds ratio | p value |
|---|---|---|---|---|
| Mean ± SE no. animals tested during 2002–2006 | 15 ± 17 | 32 ± 29 | 1.04 | <0.001 |
| Sheep dairy farm | ||||
| No | 196 | 64 | 3.3 | <0.001 |
| Yes | 29 | 31 | ||
| Flock of familial origin | ||||
| No | 70 | 24 | ||
| Yes | 155 | 71 | 1.3 | 0.29 |
| Flock of external origin | ||||
| No | 126 | 58 | ||
| Yes | 99 | 37 | 0.8 | 0.41 |
| Member of a producer organization during C0–C2006 | ||||
| No | 104 | 35 | ||
| Yes | 121 | 60 | 1.5 | 0.12 |
| Follow-up of farm results during C0–C2006 | ||||
| No | 112 | 36 | ||
| Yes | 113 | 59 | 1.6 | 0.05 |
| Organic farm during C0–C2006 | ||||
| No | 211 | 94 | ||
| Yes | 14 | 1 | 0.2 | 0.08 |
| Sent flock animals to breeding centers during C0–C2006 | ||||
| No | 192 | 63 | ||
| Yes | 33 | 32 | 3.0 | <0.001 |
| Presence of cows during C0–C0+2 | ||||
| No | 115 | 67 | 0.4 | <0.001 |
| Yes | 110 | 28 | ||
| Presence of goats during C0–C0+2 | ||||
| No | 200 | 81 | 1.4 | 0.36 |
| Yes | 25 | 14 | ||
| Presence of pigs during C0–C0+2 | ||||
| No | 216 | 93 | 0.5 | 0.40 |
| Yes | 9 | 2 | ||
| Presence of poultry during C0–C0+2 | ||||
| No | 209 | 89 | 0.9 | 0.80 |
| Yes | 16 | 6 |
*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; SE, standard error; C2006, birth campaign 2006; C0–C0+2, period between C0 and the 2 subsequent reproduction campaigns.
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