What does a higher hypopnea index suggest?

A higher hypopnea index indicates an increase in the frequency of partial airway obstructions during sleep. The hypopnea index measures the number of hypopneic events, which are characterized by a reduction in airflow that can last for a duration of at least 10 seconds, often associated with a decrease in oxygen saturation. This suggests that individuals are experiencing more frequent episodes where their breathing is partially obstructed, which can lead to fragmented sleep and other complications.

In contrast, the other choices do not align with the implications of a higher hypopnea index. Increased airway obstruction typically results in more sleep disturbances and poorer sleep quality rather than less. Thus, the association with better overall sleep quality or higher levels of deep sleep is incorrect, as these conditions are generally compromised by a higher hypopnea index.