Résumé :
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[BDSP. Notice produite par INIST lz7R0x90. Diffusion soumise à autorisation]. Background This study assessed the nature of potential biases by comparing respondents with non-respondents from a case-control study of breast cancer in younger women. Methods The case-control study was conducted in three regions in the US : Atlanta GA, Seattle/Puget Sound WA, and central New Jersey. An abbreviated interview or mailed questionnaire was completed by willing non-respondents, most of whom had refused participation in the main study. Results Respondents and non-respondents appeared similar with respect to age, race, relative weight, smoking, family history of breast cancer, number of births, age at first birth, and several dietary items. Compared to non-respondents, case and control respondents were of shorter stature, and reported less frequent consumption of doughnuts/pastries. Respondent cases, compared with non-respondent cases, were more highly educated and more likely to have consumed alcohol regularly ; similar but not statistically significant tendencies were observed for controls. Respondent cases experienced menarche earlier than non-respondents. Respondent controls were more likely to have used oral contraceptives than non-respondents ; a similar but not statistically significant tendency was observed in cases. Comparisons of crude and simulated relative risks using available non-respondents'data generally showed a low impact of non-response on relative risks in this study. (...)
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