Hospital Practices and Research

Exploring Local Literature Bias: A Critical Evaluation of Iranian Trials on the Efficacy of Psychotherapy for Chronic Pain

Document Type : Systematic Review

Authors

Ali Zia-Tohidi 1
Zahra Shamshiri 1
Fatemeh Askari 1
Manijeh Firoozi 2

1 Faculty of Management and Accounting, Farabi Campus, University of Tehran, Qom, Iran

2 Department of Psychology, Faculty of Psychology and Education, University of Tehran, Tehran, Iran

https://doi.org/10.30491/hpr.2023.177304
Abstract
Background: Seeking local evidence on treatment efficacy is necessary if cultural factors are involved, as in psychotherapy for Chronic Pain (CP). Yet, local evidence is known to be prone to bias, making it difficult to reach reliable conclusions.
Objectives: This study aimed to critically evaluate our local evidence on the efficacy of psychotherapy on quality of life and disability in CP. It has been elaborated that, with some requirements, common meta-analytic tools can be utilized to detect and correct local evidence bias.
Methods: The protocol was registered on PROSPERO, Record [deleted for blind review]. Elmnet, Pubmed, and ProQuest were searched for randomized trials. A multilevel meta-analysis was used to capture the hierarchical structure of the data, and robust variance estimation was used for inference. Several moderation analyses were conducted, and publication and other related sources of bias were examined.
Results: Forty-two trials were initially included. Six were excluded before the analysis due to serious reporting problems undermining their validity. The SMD from 185 effect sizes was 1.08 [.87, 1.3]. The funnel plot showed a strong bias. The bias-corrected estimate from a regression-based method was 0.45 [0.04, 0.87], and from the trim-and-fill was 0.75 [0.48, 1.0].
Conclusion: While our original estimate was large, the corrected estimation showed a medium effect, fairly comparable to the international estimates. Current evidence on different sources of bias in our literature suggests low quality and questionable research practice as the first suspects for our local evidence bias.

Keywords

Pain
Quality of Life
Behavioral Medicine
Systematic Review
Meta-analysis
Iran
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Hospital Practices and Research
Volume 8, Issue 1 - Serial Number 29
Winter 2023
Pages 177-188

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