Table 1.

Predictors of impossible intubation. (forwards stepwise binary logistic regression analysis) Variables not shown in equation: Resident physician in internal medicine

	Regression-coefficient	SE	P-value	OR (95 % CI)
Gender male	0.82	0.24	p = 0.001	2.28 (1.43–3.63)
Age < 80 years	0.78	0.28	p = 0.005	2.18 (1.26–3.76)
presumed etiology			p = 0.034
presumed etiology – trauma	0.80	0.40	p = 0.046	2.22 (1.01–4.85)
presumed etiology – hypoxia	0.49	0.27	p = 0.067	1.63 (0.97–2.74)
board certified physician in Anesthesia	−0.43	0.20	p = 0.028	0.65 (0.44–0.96)
constant	−5.22	0.32	p < 0.001