# Bradford Hill

The bradford hill criteria, otherwise known as Hill's criteria for causation, are a group of nine principles that can be useful in establishing epidemiologic evidence of a causal relationship between a presumed cause and an observed effect and have been widely used in public health research. They were established in 1965 by the English epidemiologist Sir Austin bradford hill and their exact application and limits of the criteria continue to be debated. == Definition == In 1965, the English statistician Sir Austin bradford hill proposed a set of nine criteria to provide epidemiologic evidence of a causal relationship between a presumed cause and an observed effect.