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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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0.81 (0.33, 1.99)
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1.11 (0.41, 2.98)
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Studies labelled as feasibility studies
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Studies labelled as pilot studies
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1.72 (0.54, 5.43)
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1.31 (0.41, 4.20)
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Randomized studies
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Non-randomized interventional studies
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0.73 (0.26, 2.03)
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0.64 (0.21, 1.90)
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Observational studies
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Non-randomized interventional studies
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1.79 (0.63, 5.15)
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1.64 (0.53, 5.12)
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Quantitative studies
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Studies collecting both quantitative and qualitative data
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0.73 (0.26, 2.00)
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0.65 (0.21, 2.01)
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Qualitative studies
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Studies collecting both quantitative and qualitative data
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0.19 (0.04, 0.82)
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0.13 (0.03, 0.61)
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Industry sponsored
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Non-industry sponsored studies
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0.73 (0.17, 3.18)
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0.66 (0.15, 2.89)
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Progression criteria stated in protocol
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No progression criteria stated in protocol
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1.74 (0.71, 4.28)
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1.53 (0.59, 3.96)
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