biostudies-literatureUnknown24(1)Chen Y<h4>Background</h4>Telephone interventions are promising for managing glycated hemoglobin A1c (HbA1c) levels in patients with type 2 diabetes mellitus (T2DM). However, optimal follow-up parameters, such as frequency, duration, content, and intervals, are yet to be standardized. This meta-analysis assesses the effectiveness of nurse-led telephone interventions in controlling HbA1c levels, with subgroup analyses based on these variables to provide evidence-based recommendations.<h4>Methods</h4>Searches were conducted across PubMed, Web of Science, Cochrane Library, Embase, Chinese Biomedical Literature Database (CBM), China National Knowledge Infrastructure (CNKI), Wanfang, and China Science and Technology Journal Database (VIP) until February 2024. Study quality was evaluated using CochraneBMC nursing284https://www.ebi.ac.uk/biostudies/studies/S-EPMC11907934biostudies-literatureEffects of nurse-led telephone interventions on HbA1c levels in patients with type 2 diabetes: a Meta-analysis-based evaluation of follow-up protocols.PMC11907934Ke XGuo YZhou TSu LChen YfalseEffects of nurse-led telephone interventions on HbA1c levels in patients with type 2 diabetes: a Meta-analysis-based evaluation of follow-up protocols.<h4>Background</h4>Telephone interventions are promising for managing glycated hemoglobin A1c (HbA1c) levels in patients with type 2 diabetes mellitus (T2DM). However, optimal follow-up parameters, such as frequency, duration, content, and intervals, are yet to be standardized. This meta-analysis assesses the effectiveness of nurse-led telephone interventions in controlling HbA1c levels, with subgroup analyses based on these variables to provide evidence-based recommendations.<h4>Methods</h4>Searches were conducted across PubMed, Web of Science, Cochrane Library, Embase, Chinese Biomedical Literature Database (CBM), China National Knowledge Infrastructure (CNKI), Wanfang, and China Science and Technology Journal Database (VIP) until February 2024. Study quality was evaluated using Cochrane2025-01-01T00:00:00Z2025 Mar2025-04-05T22:07:50.758Z2025-04-05T22:07:50.758ZS-EPMC119079344008293310.1186/s12912-025-02782-x