Table 2.
Total No. of lesions | Total No. of lesions minus chronic pleuritis | |||||||
---|---|---|---|---|---|---|---|---|
Production system | No. of lesions | Prevalence (%) | No. of slaughtered pigs | Odds Ratio | No. of lesions | Prevalence (%) | No. of slaughtered pigs | Odds Ratio* |
Organic/free-range | 79,174 | 39.4 | 201,160 | 1.01 | 40,830 | 20.3 | 201,160 | 1.34 |
Conventional | 459,239 | 39.1 | 1,173,213 | 1.00 | 178,428 | 15.2 | 1,173,213 | 1.00 |
*P-value to test the statistical difference between the observed prevalences was <0.0001.