Medicine Severe obstructive sleep apnea is defined as an apnea-hypopnea index of greater than? A 10 events/ hour B 15 events/ hour C 20 events/ hour D 30 events/ hour 💡 Explanation Severe obstructive sleep apnea is defined as an apnea-hypopnea index of greater than? ✓ Correct Answer: D. 30 events/ hour