Fig. 1From: Obstructive sleep apnoea accelerates FEV1 decline in asthmatic patientsDecline in FEV1 per year among the three groups. AHI, apnoea-hypopnoea index; *p < 0.05 compared to AHI <5; + p < 0.05 compared to 5 ≤ AHI < 30Back to article page