Table 2 Features that have a discrete value
Features | Feature importance | Mean | Std | Description |
|---|---|---|---|---|
Age(year) | 0.062004 | 43.098 | 14.08 | - |
BMI (kg/m2) | 0.041490 | 27.698 | 5.83 | Body Mass Index |
Mouth Opening(cm) | 0.068357 | 4.376 | 0.77 | The linear distance between the edge of the upper tooth (gum) and the edge of the lower tooth on the same side. |
Neck Circumference(cm) | 0.086946 | 37.405 | 3.63 | The measurement of Neck Circumference (NC) entails assessing the circumference of the neck in its neutral position, just below the Adam’s apple. |
Neck Length(cm) | 0.023407 | 11.165 | 1.33 | This parameter is determined by measuring the distance from the external occipital protuberance to the seventh cervical vertebra in the neutral position of the neck. A measurement of less than 7 cm is correlated with an increased probability of encountering a difficult airway. |
Thyromental Distance(cm) | 0.030534 | 9.361 | 1.49 | It is determined by measuring the linear distance between the thyroid notch and the mentum in the condition of full neck extension. |
Sternomental Distance(cm) | 0.106998 | 16.648 | 2.11 | The linear distance between the upper border of the manubrium of the sternum and the mentum in the condition of full neck extension. |
Rhinionmentum Distance(cm) | 0.023414 | 6.795 | 0.87 | The linear distance between the mentum and the base of the nasal septum. |
Neck extension degree (clinometry) | 0.044165 | 43.511 | 11.75 | The angle between the horizon line and the neck in the state of maximum neck extension. |
Anterior neck Flexion degree (clinometry) | 0.039345 | 71.645 | 13.11 | The angle between the horizon line and the neck in the state of maximum flexion of the neck. |
left lateral neck flexion degree (clinometry) | 0.032863 | 45.463 | 10.50 | The angle between the midline and the maximum bending of the neck to the left. |
Right lateral neck flexion degree (clinometry) | 0.032591 | 47.778 | 11.02 | The angle between the midline and the maximum bending of the neck to the right. |
Neck extension degree (application) | 0.037774 | 41.502 | 13.13 | The angle between the horizon line and the neck in the state of maximum neck extension. |
Anterior neck Flexion degree(application) | 0.053250 | 73.685 | 14.56 | The angle between the horizon line and the neck in the state of maximum flexion of the neck. |
left lateral neck flexion degree (application) | 0.025654 | 40.704 | 12.10 | The angle between the midline and the maximum bending of the neck to the left. |
Right lateral neck flexion degree (application) | 0.030172 | 53.357 | 19.62 | The angle between the midline and the maximum bending of the neck to the right. |
AASI | 0.031471 | 0.622 | 0.14 | AcromioAxillo Suprasternal Notch Index. |
Hyomental Distance(cm) | 0.045787 | 5.814 | 0.98 | The linear distance between the hyoid bone and the mentum in the condition of full neck extension. |
HMDn | 0.025921 | 4.152 | 0.69 | The ratio of hyomental distance in neutral head position |
HMDR | 0.027409 | 1.418 | 0.25 | The ratio of hyomental distance in neutral head position (HMDn) to hyomental distance in full extension of the head (HMDe). |