Table 3. Multivariable logistic regression analysis of voice parameters and DMV.

Voice parameters	OR	95% CI	P value
o_f3	0.999	0.997–1.000	0.031
e_f3	0.999	0.997–1.000	0.019
e_f4	0.999	0.998–1.000	0.040
i_f2	0.999	0.998–1.000	0.019
i_f3	0.998	0.997–0.999	0.002
u_f4	0.998	0.997–1.000	0.009
ci_f3	0.998	0.997–1.000	0.018
ci_f4	0.998	0.997–1.000	0.023
en_f3	0.999	0.998–1.000	0.029

DMV, difficult mask ventilation; OR, odds ratio; CI, confidence interval.