Measures of familial aggregation depend on definition of family history: meta-analysis for colorectal cancer.

Abstract excerpt

OBJECTIVE: Familial aggregation, a primary theme in genetic epidemiology, can be estimated from family studies based on an index person. The excess risk due to the presence of affected family members can be classified according to whether disease in the relatives is considered a risk factor for the index person (type I relative risk) or whether the disease status of the index person is considered a risk factor...

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