Fig. 2From: Prevalence of obstructive sleep apnoea in acute coronary syndrome patients: systematic review and meta-analysisForest plot of OSA prevalence in studies using polysomnography by OSA severity sub-groups (Mild AHI =5–14; Moderate AHI = 15–29; Severe AHI > 30) post-surgical intervention. ES = effect size; OSA = obstructive sleep apnoea; AHI = apnoea/hypoxia index. See Additional File 4 for referencesBack to article page