Fig. 2From: The impact of semi-upright position on severity of sleep disordered breathing in patients with obstructive sleep apnea: a two-arm, prospective, randomized controlled trialA. The effect of semi-upright position on apnea–hypopnea index in the two groups per-protocol analysis. B. The effect of semi-upright position on obstructive index in the two groups per-protocol analysisBack to article page