Rocuronium versus saline for effective facemask ventilation during anesthesia induction: a double-blinded randomized placebo-controlled trial

Table 3 Results of Backwards stepwise regression for explaining tidal volume during mask ventilation

Dependent variable	Independent explanatory variables	Estimate	Standardized partial regression coefficients	Standard error	P value
Needed breaths for plateaued-capnogram	No explanatory variable
Needed breaths for TV > 5 ml kg-IBW⁻¹	Inter-incisor distance	-0.329	-0.399	0.129	0.015
Needed breaths for TV > 5 ml kg-IBW⁻¹	Apnea hypopnea index	0.134	0.347	0.0607	0.033
Mean TV change from breath 1	Upper lip bite test	3.45	0.326	1.567	0.034
Mean TV change from breath 1	Neck circumference	0.309	0.367	0.125	0.018

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