Preoperative X-ray C2C6AR is applicable for prediction of difficult laryngoscopy in patients with cervical spondylosis

Table 3 Predictive values of cervical mobility indicators for predicting difficult laryngoscopy

Indicators	AUC	95 % CI	SE	P-value
BMI	0.574	0.487–0.661	0.044	0.136
MMT (class I-II/class III-IV)	0.586	0.489–0.684	0.050	0.081
HMDn (cm)	0.569	0.466–0.671	0.052	0.183
HMDe (cm)	0.586	0.492–0.679	0.048	0.102
HMDR	0.520	0.423–0.617	0.049	0.703
C₀C₁Dn (mm)	0.541	0.436–0.647	0.054	0.404
C₀C₁De (mm)	0.571	0.482–0.660	0.045	0.152
C₀C₁DR	0.524	0.433–0.616	0.047	0.624
C₁C₂Dn (mm)	0.555	0.451–0.659	0.053	0.266
C₁C₂De (mm)	0.554	0.459–0.649	0.049	0.277
C₁C₂DR	0.513	0.415–0.610	0.050	0.796
C ₂ C ₆ An (°)	0.629	0.533–0.724	0.049	0.013
C₂C₆Ae (°)	0.530	0.421–0.638	0.055	0.568
C ₂ C ₆ AR	0.714	0.633–0.794	0.041	< 0.001

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