Table 5.

Concordance of observers' second scenogram obstruction diagnoses with the final diagnosis, n (%)

	Mechanical obstruction by final diagnosis			Specificity, %	Sensitivity, %	PPV, %	NPV, %	Accuracy, %
	Yes	None	Total
I Observer
Yes	34 (81)	4 (100)	38 (82.6)	81	0	88.47	0	73.91
None	8 (19)	0 (0)	8 (17.4)
II Observer
Yes	32 (76.2)	4 (100)	36 (78.3)	76.19	0	88.88	0	69.56
None	10 (23.8)	0 (0)	10 (21.7)
III Observer
Yes	35 (83.3)	2 (50)	37 (80.4)	83.33	50	94.59	22.23	80.43
None	7 (16.7)	2 (50)	9 (19.6)
Total	42 (91.3)	4 (8.7)	46 (100)