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To examine the relationships between study quality, author prestige, journal impact factors, and citation rates of trials and to examine whether journal impact factors mediated the relationships between study quality and author prestige on citation rates.
This uncertainty is the result of the disparate methods that have been used in these investigations, incomplete and contradictory findings, and an inverse relationship between study quality and the reported strength of these associations.
For two outcomes, evidence of a statistically significant relationship between study quality and effect size magnitude suggest that the overall mean effect may be inflated and that our conclusions about treatment effect should be based only on those studies rated medium quality: paid employment (g = 0.06; 95% CI [-0.01, 0.12]); formal employment (g = 0.12; 95% CI [0.05, 0.19]).
Thus, the apparent relation between study quality and observed effect on FMD should be interpreted with caution.
Thus, there was no consistency between study quality and outcome.
We found an inverse relation between study quality and efficacy of SMBG.
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On the other hand, we found no statistical significant associations between study quality scores and either pregnancy or psychological outcomes, no statistically significant differences in dropout rates between intervention and control groups, and, as suggested by the large fail-safe numbers, the improvements generally appeared quite robust.
There was a significant correlation between lower study quality and higher treatment success.
The mean percentage transferability information score for the full checklist was 66.9% ± 13.6%, and the results obtained for the sub-checklist (68.8% ± 15.1%) were very similar to the full-checklist, suggesting a high correlation between overall study quality and a good transferability score.
Regardless of the heterogeneity of the studies, it is remarkable that there is an inverse relationship between study quality on the one hand, and efficacy on glycemic control and quality of life parameters on the other.
Plots of the relationship between study quality (1/variance of reported results) and effect size in the literature on amyotrophic lateral sclerosis, for example, suggest that small, high variance studies that yield positive results are common in the literature, whereas those that yield negative results are nearly absent [76].
More suggestions(15)
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