Predictive Values of Preoperative Tests for Difficult Laryngoscopy and Intubation in Adult Patients at Tikur Anbessa Specialized Hospital

Table 3

Sensitivity, specificity, positive predictive values, and negative predictive values for preoperative parameters against difficult laryngoscopy among surgical patients in Tikur Anbessa Hospital from February 1 to March 30, 2016.

Parameter	Sn (%)	Sp (%)	PPV (%)	NPV (%)	Area	value	95% CI	Accuracy (%)
IID	51.5	81.3	30.35	91.4	0.336	0.002	0.228–0.444	33.6
MP	54.5	76.6	26.8	91.4	0.656	0.004	0.549–0.762	65.6
MC	51.5	94.7	60.7	92.5	0.731	0.000	0.621–0.841	73.1
TMD	51.5	85.2	35.4	91.7	0.317	0.001	0.208–0.425	31.7
SMD	30.3	87.6	27.7	88.8	0.411	0.099	0.298–0.523	41.1

Sn = sensitivity; Sp = specificity; PPV = positive predictive value; NPV = negative predictive value; CI = confidence interval; .