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For Northern Sweden Mammary Screening Cohort (NSMSC), women were not initially matched on this factor, and 88% of the cases had at least one control matched on menopausal status (pre- and peri-menopausal combined or post-menopausal).
All cohorts also matched on menopausal status at blood donation.
The Shanghai Women's Health Study additionally matched on menopausal status for women.
Initially, women were not matched on menopausal status in this cohort; however, 88% of the cases had at least one control matching on this factor (pre- and peri-menopausal combined or post-menopausal).
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Each case was compared to 4 controls matched on age, menopausal status at enrolment, and serum storage duration.
Three controls were selected matched on age, cohort, menopausal status and post-menopausal hormone use.
As the cases and controls were matched on age and menopausal status, they were comparable in these aspects.
Three controls for each confirmed incident RA case were randomly chosen from among participants with stored blood, matched on age (±1 year), menopausal status and postmenopausal hormone use, as well as on time of data collection and fasting status at blood draw.
All controls were matched on cohort, age, Caucasian race, menopausal status, and postmenopausal hormone use.
Histologically confirmed breast cancer cases (n = 1,011) and controls (n = 1,011) with no present or previous history of cancer, matched on year of birth and menopausal status, were selected from several teaching hospitals and community in Seoul during 1995 2003.
In the NHS/NHS II, each case with confirmed incident or prevalent RA with buccal samples was matched on year of birth, race/ethnicity, menopausal status, and postmenopausal hormone use to a single healthy woman in the same cohort without RA.
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