Integration of non-randomized studies with randomized controlled trials in meta-analyses of clinical studies: a meta-epidemiological study on effect estimation of interventions.

Interpretation of results and conclusions: whether the potential impact of including NRSIs was explicitly stated in the discussion section, whether positive results were reported when RCT and NRSI results were inconsistent (for example, when RCTs and NRSIs were combined separately, the RCT results did not reach statistical significance, the NRSI achieved significant results, but the conclusion of the systematic review reported only significant results).

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