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Non-response can bias study results. This study investigated the extent of response bias on selected study variables associated with colorectal cancer (CRC) arising from failure to provide a blood sample. The Ontario Familial Colorectal Cancer Registry collected data with questionnaires on family history, personal history and frequency of food consumption, in addition to obtaining a blood sample. A total of 3447 cases and controls was compared on age, sex, selected socio-economic and dietary factors, and on personal medical history and family history of colorectal cancer, separately for those who provided a blood sample and for those who did not. Findings indicated that case-control comparisons lead to biased odds ratios for associations between CRC and age, sex, fat and fruit consumption, history of elevated triglycerides, and a family history of colorectal cancer. Biased associations have implications for the design and conduct of genetic epidemiological studies.
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Response bias from failure to provide a blood sample among participants in the Ontario Familial Colorectal Cancer Registry.
2005
in English
0494074787 9780494074787
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Edition Notes
Source: Masters Abstracts International, Volume: 44-02, page: 0836.
Thesis (M.Sc.)--University of Toronto, 2005.
Electronic version licensed for access by U. of T. users.
GERSTEIN MICROTEXT copy on microfiche (2 microfiches).
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