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Table 1 Principles of evidence synthesis of systematic reviews

From: The effectiveness of interventions in supporting self-management of informal caregivers of people with dementia; a systematic meta review

Evidence
 Consistent positive, significant effects on a specific outcome in at least one high quality systematic review (based on at least two underlying effect studies)
Limited evidence
 Effects on a specific outcome in at least one high quality systematic review (based on one underlying effect study)
Inconclusive evidence
 Inconsistent effects on a specific outcome, because at least one high quality systematic review (including at least two underlying studies) shows positive, significant effects, while other review(s) included did not find such effects.
No evidence
 None of the included reviews found consistent positive, significant effects on a specific outcome.
No research found
 None of the included reviews examined effects on a specific outcome.