Fig. 6From: The relationship between obstructive sleep apnea and asthma severity and vice versa: a systematic review and meta-analysisA The relationship between OSA and %FEV1 in asthma patients; B The relationship between asthma and AHI in OSA patients; C The relationship between OSA and asthma severity in asthma patients; D The relationship between asthma and OSA severity in asthma patients. The funnel plot analysis of publication bias. OSA: obstructive sleep apnea; %FEV1: forced expiratory volume in one second %predicted; AHI: apnea hypopnea indexBack to article page