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ObjectiveTo evaluate the value of improved Mallampati grading combined with NoSAS questionnaire in screening for obstructive sleep apnea (OSA). MethodA total of 344 patients admitted to our hospital for sleep disorders were studied. All patients were measured for their height, weight, neck circumference and other parameters. NoSAS scores, improved Mallampati grading and polysomnography (PSG) were performed in these patients. According to AHI in PSG monitoring results, patients were divided into non-osa group (AHI30) according to the PSG re