GPT and obstructive sleep apnea syndrome: Qu Yinfei [9] found that the ALT, AST, and AHI levels of patients with OSAHS were positively correlated (r = 0.293, p < 0.05 and r = 0.275, p < 0.05), and ALT levels were negatively correlated with LSaO2 (r = −0.240, p < 0.05), suggesting that as the severity of OSAHS increases, ALT and AST levels increase.