TJP1 and obstructive sleep apnea syndrome: Spearman’s correlation analysis showed that serum melatonin was significantly negatively correlated with ZO-1 (r = −0.19, p < .05) and LPS (r = −0.20, p < .05) in the moderate-OSA group; serum melatonin was significantly negatively correlated with ZO-1 (r = −0.46, p < .01), LPS (r = −0.35, p < .01) and CPR (r = −0.30, p < .05) in the severe-OSA group.