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Estimated category
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Reference category (odds ratio = 1)
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Originally submitted informed consent forms
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Final approved informed consent forms
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Odds ratio (95% confidence interval)
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Odds ratio (95% confidence interval)
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2017 or more recent
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2016 or prior
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0.84 (0.38, 1.87)
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0.80 (0.36, 1.78)
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Studies labelled as feasibility studies
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Studies labelled as pilot studies
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8.09 (3.11, 21.03)
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7.44 (2.85, 19.41)
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Randomized studies
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Non-randomized interventional studies
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2.34 (0.91, 6.03)
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2.49 (0.97, 6.35)
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Observational studies
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Non-randomized interventional studies
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2.02 (0.84, 4.85)
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1.83 (0.77, 4.35)
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Quantitative studies
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Studies collecting both quantitative and qualitative data
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0.49 (0.22, 1.09)
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0.47 (0.21, 1.04)
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Qualitative studies
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Studies collecting both quantitative and qualitative data
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0.66 (0.16, 2.76)
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0.63 (0.15, 2.61)
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Industry sponsored
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Non-industry sponsored studies
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0.38 (0.09, 1.65)
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0.34 (0.08, 1.46)
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Progression criteria stated in protocol
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No progression criteria stated in protocol
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2.37 (1.14, 4.91)
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2.59 (1.25, 5.36)
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