Nutritional outcomes.

Nutritional outcomes.</p

Nutrition-related complications.

Nutrition-related complications.</p

Baseline characteristics of the patients.

Baseline characteristics of the patients.</p

Consort flowchart.

Consort flowchart.</p

Clinical outcomes.

Clinical outcomes.</p

Selected factors related to difficult intubation; multivariable analysis.

Selected factors related to difficult intubation; multivariable analysis.</p

Distribution of the intubation difficulty scale (IDS).

Distribution of the intubation difficulty scale (IDS).</p

A comparison of the area under the receiver operating characteristic curve (AUC) of the three equations.

A comparison of the area under the receiver operating characteristic curve (AUC) of the three equations.</p

Demographic data of 1,015 patients.

Demographic data of 1,015 patients.</p

Predictive value of the three models tested.

Predictive value of the three models tested.</p