Table II.
Baseline characteristics and diagnostic accuracy of ultrasound taking MRCP as gold standard (n=242).
| Total (n) | Sensitivity | Specificity | PPV | NPV | Overall Diagnostic Accuracy | |
|---|---|---|---|---|---|---|
| Age, years | ||||||
| ≤45 | 70 | 86% | 70% | 87.76% | 66.67% | 81.43% |
| >45 | 172 | 84% | 82.98% | 92.92% | 66.10% | 83.72% |
| Gender | ||||||
| Male | 122 | 85.56% | 81.25% | 92.77% | 66.67% | 84.43% |
| Female | 120 | 83.53% | 77.14% | 89.87% | 65.85% | 81.67% |
| Duration of symptoms, days | ||||||
| ≤40 | 167 | 84.55% | 70.45% | 88.89% | 62.00% | 80.84% |
| >40 | 75 | 84.62% | 95.65% | 97.78% | 73.33% | 88.00% |
| Cause of obstruction | ||||||
| Choledocholithiasis | 85 | 84.13% | 68.18% | 88.33% | 60.00% | 80.00% |
| Stricture | 61 | 88.89% | 93.75% | 97.56% | 75.00% | 90.16% |
| Carcinoma of head of pancreas | 39 | 78.57% | 90.91% | 95.65% | 62.50% | 82.05% |
| Gall bladder carcinoma | 26 | 76.47% | 66.67% | 81.25% | 60.00% | 73.08% |
| Periampullary carcinoma | 21 | 87.50% | 80.00% | 93.33% | 66.67% | 85.71% |
| Cholangiocarcinoma | 10 | 100% | 75% | 85.71% | 100% | 90.00% |
PPV: Positive predicted value, NPV: Negative predicted value.