Changes

Analytic studies may compare exposure to these factors in animals with disease to those without, or may compare the occurrence of disease amongst 'exposed' animals to 'unexposed' animals. Although there are considerable difficulties in establishing causation of disease, the results of these studies can provide useful evidence regarding possible risk factors for disease. Although it is important to carefully consider the source population when undertaking these studies, the results may be able to be extrapolated out to a wider population than for descriptive studies. One example is that of the association between smoking and lung cancer - although the prevalence of lung cancer in the UK is likely to be very different from that in Mongolia, the association between smoking and development of lung cancer in both of these countries is likely to be similar.  

Analytic studies may compare exposure to these factors in animals with disease to those without, or may compare the occurrence of disease amongst 'exposed' animals to 'unexposed' animals. Although there are considerable difficulties in establishing causation of disease, the results of these studies can provide useful evidence regarding possible risk factors for disease. Although it is important to carefully consider the source population when undertaking these studies, the results may be able to be extrapolated out to a wider population than for descriptive studies. One example is that of the association between smoking and lung cancer - although the prevalence of lung cancer in the UK is likely to be very different from that in Mongolia, the association between smoking and development of lung cancer in both of these countries is likely to be similar.  

[[Category:Veterinary Epidemiology - Introduction|D]]

[[Category:Veterinary Epidemiology - Introduction|D]]