Objective:The aim of this study is to assess the association between obstructive sleep apnea-hypopnea syndrome and type 2 diabetes(T2DM).Method:Databases such as Chinese Biomedical Literature Database,PubMed,Chinese Academic Journals full-text data base,Wanfang Resource Database and Chongqing VIP have been searched to collect literatures about the relationship between OSAHS and type 2 diabetes.The papers and unpublished articles were also manually retrieved.Randomized controlled trial conformed to the condi...