The quality of the study was evaluated according to the Cochrane scale, and data were analyzed by RevMan software.



RevMan
Randomized controlled trials of Chinese patent medicine in the treatment of prediabetes were searched in the databases of CNKI, WanFang, VIP, CBM, PubMed, Web of Science and Embase using the computer with the search deadline on June 2, 2022. 
CNKI
Randomized controlled trials of Chinese patent medicine in the treatment of prediabetes were searched in the databases of CNKI, WanFang, VIP, CBM, PubMed, Web of Science and Embase using the computer with the search deadline on June 2, 2022. 
WanFang
Randomized controlled trials of Chinese patent medicine in the treatment of prediabetes were searched in the databases of CNKI, WanFang, VIP, CBM, PubMed, Web of Science and Embase using the computer with the search deadline on June 2, 2022. 
VIP
Randomized controlled trials of Chinese patent medicine in the treatment of prediabetes were searched in the databases of CNKI, WanFang, VIP, CBM, PubMed, Web of Science and Embase using the computer with the search deadline on June 2, 2022. 
CBM
Randomized controlled trials of Chinese patent medicine in the treatment of prediabetes were searched in the databases of CNKI, WanFang, VIP, CBM, PubMed, Web of Science and Embase using the computer with the search deadline on June 2, 2022. 
PubMed
Randomized controlled trials of Chinese patent medicine in the treatment of prediabetes were searched in the databases of CNKI, WanFang, VIP, CBM, PubMed, Web of Science and Embase using the computer with the search deadline on June 2, 2022. 
Web of Science
Randomized controlled trials of Chinese patent medicine in the treatment of prediabetes were searched in the databases of CNKI, WanFang, VIP, CBM, PubMed, Web of Science and Embase using the computer with the search deadline on June 2, 2022. 
Embase