Table 4.
Diagnostic accuracy test results from complete cases included in the meta-analysis (n = 4). Complete cases: all patients underwent both the index test (preoperative ultrasonography) and reference test (surgical exploration), irrespective of the index test results. Clinical findings during follow-up (if reported) were used to calculate the amount of false negatives (FN) and true negatives (TN)
| Author, year | Patients (n) |
TP | FP | FN | TN | Sensitivity (%) |
Specificity (%) |
PPV (%) |
NPV (%) |
US CPPVa (%) |
OR CPPVb (%) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Chou, 1996 | 179 | 49 | 11 | 0 | 119 | 100 | 91.5 | 81.7 | 100 | 33.5 | 27.4 |
| Kazez, 1998 | 46 | 23 | 2 | 1 | 20 | 95.8 | 90.9 | 92 | 95.2 | 54.3 | 52.2 |
| Lawrenz, 1994 | 23 | 14 | 4 | 4 | 1 | 77.8 | 20.0 | 77.8 | 20.0 | 78.3 | 78.3 |
| Shehata, 2013 | 246 | 75 | 20 | 7 | 144 | 91.7 | 87.7 | 75.9 | 96.2 | 38.6 | 33.3 |
TP true positive, FP false positive, FN false negative, TN true negative, PPV positive predictive value, NPV negative predictive value, US ultrasound, CPPV contralateral patent processus vaginalis
aAmount (%) of contralateral patent processus vaginalis as determined by ultrasonography
bAmount (%) of contralateral patent processus vaginalis detected intraoperatively