• 1. Evidence-Based Medicine Center, School of Basic Medical Sciences, Lanzhou University, Lanzhou 730000, P. R. China;
  • 2. Key Laboratory of Evidence-based Medicine of Gansu Province, Lanzhou 730000, P. R. China;
  • 3. School of Nursing, Gansu University of Chinese Medicine, Lanzhou 730000, P. R. China;
  • 4. The First Clinical School of Medicine, Lanzhou University, Lanzhou 730000, P. R. China;
  • 5. The Second Clinical Medical College of Lanzhou University, Lanzhou 730000, P. R. China;
  • 6. Gansu Provincial Hospital of Traditional Chinese Medicine, Lanzhou 730050, P. R. China;
  • 7. Evidence-Based Medicine Center, Tianjin University of Traditional Chinese Medicine, Tianjin 301617, P. R. China;
  • 8. Key Laboratory of Evidence-Based Evaluation of Traditional Chinese Medicine, National Medical Products Administration, Tianjin 301617, P. R. China;
ZHANG Junhua, Email: zjhtcm@foxmail.com; TIAN Jinhui, Email: tjh996@163.com
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Accurately assessing the risk of bias is a critical challenge in network meta-analysis (NMA). By integrating direct and indirect evidence, NMA enables the comparison of multiple interventions, but its outcomes are often influenced by bias risks, particularly the propagation of bias within complex evidence networks. This paper systematically reviews commonly used bias risk assessment tools in NMA, highlighting their applications, limitations, and challenges across interventional trials, observational studies, diagnostic tests, and animal experiments. Addressing the issues of tool misapplication, mixed usage, and the lack of comprehensive tools for overall bias assessment in NMA, we propose strategies such as simplifying tool operation, enhancing usability, and standardizing evaluation processes. Furthermore, advancements in artificial intelligence (AI) and large language models (LLMs) offer promising opportunities to streamline bias risk assessments and reduce human interference. The development of specialized tools and the integration of intelligent technologies will enhance the rigor and reliability of NMA studies, providing robust evidence to support medical research and clinical decision-making.

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