Table 1 Baseline characteristics of the patients.

	Total (N = 1979)
Patient age, (years)	67.0 (55.0–77.0)
Patient sex, (male)	1243 (62.8)
Patient BMI, (kg/m²)	22.9 (20.5–25.2)
Patient BMI grade
Underweight (< 18.5 kg/m²)	216 (10.9)
Normal weight (18.5–24.9 kg/m²)	1244 (62.9)
Preobese (25.0–29.9 kg/m²)	448 (22.6)
Obese (≥ 30.0 kg/m²)	71 (3.6)
ETI indication
Non-traumatic	1787 (90.3)
Cardiac arrest	666 (33.7)
Altered mental status	346 (17.5)
Respiratory distress	579 (29.3)
Shock	119 (6.0)
Other medical illness	77 (3.9)
Traumatic	192 (9.7)
Cardiac arrest	71 (3.6)
Traumatic shock	15 (0.8)
Head and neck trauma	88 (4.4)
Other trauma	18 (0.9)
Anticipated difficult airway	504 (25.5)
Methods for ETI
Crash approach*	737 (37.2)
RSI	1041 (52.6)
Sedative only	124 (6.3)
No medication	77 (3.9)
Surgical airway^†	9 (0.5)
Complications^‡
Overall	236 (11.9)
Esophageal intubation	76 (3.8)
Unrecognized esophageal intubation	1 (0.05)
Post-intubation hypotension	66 (3.3)
Post-intubation hypoxia	53 (2.7)
Post-intubation arrest	37 (1.9)
Dental injury	17 (0.9)
Agitation	12 (0.6)
Vomit	2 (0.1)
Post-intubation dysrhythmia	1 (0.05)
Pneumothorax	1 (0.05)

Data are presented as medians (interquartile ranges) or numbers (%).
BMI body mass index, ETI endotracheal intubation, RSI rapid sequence intubation.
*Crash approach: used for unconscious, unresponsive patients expected not to be resistant to laryngoscopy and who needed immediate airway security.
^†Patients whose airways have been secured with a surgical technique.
^‡Postintubation cardiac arrest was defined as cardiac arrest occurring within 30 min after ETI. Postintubation hypotension was defined as a systolic blood pressure of < 90 mm Hg at any time within the first 30 min following ETI. Postintubation hypoxemia was defined as peripheral oxygen saturation of < 80% at any point within 30 min following ETI. Cardiac arrest, hypotension, and hypoxemia existing before ETI were not considered postintubation complications.

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