Magnitude and Predisposing Factors of Difficult Airway during Induction of General Anaesthesia

Table 2

Airway parameters and risk factors, value < 0.05.

Variable	Frequency
Oropharyngeal view (OPV)
OPV I & II	150 70.8%}
OPV III & IV	31 14.6%
Jaw slide grade (JSD)
JSD A	73 34.4%}
JSD B	91 42.9%}
JSD C	17 8%
Mouth opening (interincisor length)
<30 mm	18 8.9%}
31–50 mm	149 70.3%}
>51 mm	13 6.1%
Mandibular length (MBL)
<70 mm	4 1.9%}
71–85 mm	30 14.2%}
86–95 mm	80 37.7%}
>96  mm	67 31.6}
Sternomental distance (SMD)
81 mm–120 mm	65 30.7%}
121 mm–135 mm	76 35.6%}
>136 mm	40 18.9}
Thyromental distance (TMD)
<50 mm	2 0.9%}
51–65 mm	67 31.6%}
66–75 mm	67 31.6%}
>76 mm	45 21.2%}