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Criteria | Low risk | High risk | Unclear risk |
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Study design | Prospective or retrospective cohort, nested case-control | Case-control | Information not reported |
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Adjustment of confounders | Adjusted for 4 or more of the following: age, education/income, family history of cancer, hormone therapy use/oral contraceptive use/reproductive history, smoking status, and alcohol consumption | Adjusted for 3 or less of the following: age, education/income, family history of cancer, hormone therapy use/oral contraceptive use/reproductive history, smoking status, and alcohol consumption | Information not reported |
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Selection of participants and their eligibility criteria | Studies clearly stating their eligibility criteria and the sources and methods of selection of participants | Studies not clearly stating their eligibility criteria and the sources and methods of selection of participants | Information not reported |
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Measurement of predictor variables | Identified through objective measures | Self-reported or pharmaceutical prescriptions | Information not reported |
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Breast cancer diagnosis | Histologically confirmed or identified through cancer registry/medical records | Self-reported | Information not reported |
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Study size | Large enough for adequate power | Not large enough for adequate power | Information not reported |
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Handling of missing data | Missing data analysis specified | Missing data deleted from analysis | Information not reported |
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Reasons for nonparticipation of individuals at each stage of the study | Reasons clearly reported for each stage of study | Reasons not reported for each stage of study | Information not reported |
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