Wang T, et al. - Researchers evaluated the link between obesity and difficult intubation by analyzing databases of PubMed, Embase, and the Cochrane controlled trials register. Obese patients had a body mass index ≥ 30 kg·m^{- 2}. The primary outcome included difficult tracheal intubation and secondary outcomes were the rates of difficult laryngoscopy and Mallampati score ≥ 3. In this review, papers published from 1998 to 2015 were included; overall 16 studies with 204,303 participants were analyzed. They found that in adults patients undergoing general surgical procedures, there was an association of obesity with an increased risk of difficult intubation, difficult laryngoscopy and Mallampati score ≥ 3. However, data revealed no association of obesity and risks of difficult intubation vs non-obesity in the cohort studies and the elective tracheal intubation, no relation to an increased risk of difficult laryngoscopy in the sniffing position was observed.