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| Evidence
base for oc screening |
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| Clinical
Practice Guidelines |
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| Report of the
U.S. Preventive Services Task |
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| Force, 2nd
ed., 1996 (cont.) |
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| n | I: Evidence from
at least 1 properly random- ized |
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| controlled trial |
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| n | II-1: …from
well-designed controlled trials w/o |
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| randomization |
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| n | II-2: …from
well-designed cohort or case-control |
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| analytic studies
from >1 research grp |
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| n | II-3: …from
multiple time series w/ or w/o the |
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| intervention
(dramatic results, e.g., penicillin) |
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| n | III: Experts, experience, case reports |
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| ohcd4_03 |
| 41 |