An obese 56-year-old married man complains of daytime sleepiness, and his wife states that he snores, snorts, and gasps during nighttime sleep. What polysomnographic finding is needed to confirm the diagnosis of obstructive sleep apnea hypopnea?

Polysomnographic evidence of at least 5 apnea or hypopnea episodes per hour of sleep

Polysomnographic evidence of at least 15 episodes per hour of sleep

No polysomnography is necessary

Polysomnographic evidence of resolution of apneas/hypopneas with application of continuous positive airway pressure