The results of subgroup analysis.

OSA: obstructive sleep apnea; HF: heart failure; AHI: apnea-hypopnea index.OSA：阻塞性睡眠呼吸暂停（obstructive sleep apnea）；HF：心力衰竭（heart failure）；AHI：呼吸暂停低通气指数（apnea-hypopnea index）。