Table 2.

Database search

Medline (n = 138)

(Yawn*[Title/Abstract] OR “Yawning”[Mesh]) AND (airway[Title/Abstract] OR dyspnea[Title/Abstract] OR respirat*[Title/Abstract] OR breath*[Title/Abstract] OR ventilat*[Title/Abstract] OR pharyn*[Title/Abstract] OR pulmon*[Title/Abstract] OR anesthes*[Title/Abstract] OR anaesthes*[Title/Abstract] OR atelectasis[Title/Abstract] OR pneum*[Title/Abstract] OR obstruct*[Title/Abstract] OR collaps*[Title/Abstract] OR apnea[Title/Abstract] OR asthma[Title/Abstract] OR COPD[Title/Abstract] OR “Pharynx”[Mesh] OR “dyspnea”[Mesh] OR “Asthma”[Mesh] OR “Apnea”[Mesh] OR “Pulmonary Disease, Chronic Obstructive”[Mesh] OR “Pulmonary Atelectasis”[Mesh] OR “Anesthesia”[Mesh])

Embase (n = 311)

(airway:ab,ti,kw OR respirat*:ab,ti,kw OR ventilat*:ab,ti,kw OR breath*:ab,ti,kw OR pharyn*:ab,ti,kw OR pulmon*:ab,ti,kw OR anesthes*:ab,ti,kw OR anaesthes*:ab,ti,kw OR atelectasis:ab,ti,kw OR pneum*:ab,ti,kw OR obstruct*:ab,ti,kw OR collaps*:ab,ti,kw OR apnea:ab,ti,kw OR asthma:ab,ti,kw OR copd:ab,ti,kw OR “asthma”/exp OR “apnea”/exp OR “dyspnea”/exp OR “chronic obstructive lung disease”/exp OR “atelectasis”/exp OR “anesthesia”/exp OR “pharynx”/exp) AND (yawn*:ab,ti,kw OR “yawning”/exp)

ASReviews – Embase (n = 2272)

(yawn*:ab,ti,kw OR “yawning”/exp)