A

Mild obstructive sleep apnea is classified when the apnea-hypopnea index lies between 5 and 14 events per hour; values below 5 are considered normal, and higher cut-offs define moderate and severe disease. Therefore, the AHI must be greater than 5 for a diagnosis of mild sleep apnea [Arnardottir, 2016, PMID: 26541533].