Table-III.

Diagnostic accuracy of X-ray and CT scans taking PCR findings as gold standard.

	PCR Finding
Abnormal X-ray	Yes	No	Sensitivity	Specificity	PPV	NPV	Overall Diagnostic Accuracy
Yes	471	1	88.87%	66.67%	99.79%	3.28%	88.74%
No	59	2
Abnormal CT
Yes	577	10	96.67%	85.71%	98.86%	66.67%	95.88%
No	9	0