S100A12 and obstructive sleep apnea syndrome: In the OSA group, a significant, moderate positive correlation was determined between the AHI scores and ODI with S100A12 (P = 0.0001; r = 0.525 and P = 0.001; r = 0.531) and S100B values (P = 0.0001; r = 0.531 and P = 0.0001; r = 0.520).