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Level
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Ratinga
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Criteria
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Strong
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+++ or —
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Consistent findings in multiple studies of adequate methodological quality OR in one study of very good methodological quality.
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Moderate
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++ or –
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Consistent findings in multiple studies of doubtful methodological quality OR in one study of adequate methodological quality.
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Limited
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+ or -
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One study of inadequate methodological quality.
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Conflicting
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+/−
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Conflicting findings.
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Unknown
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?
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Only studies of inadequate/doubtful methodological quality.
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- aNOTE. + = positive;? = indeterminate; − = negative [17]