Table 5.
Diagnostic accuracy test results from incomplete cases included in the meta-analysis (n = 3). Incomplete cases: surgical exploration was only performed when the index test (preoperative ultrasonography) yielded positive 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 | Follow-up (months) | Sensitivity (%) | Specificity (%) | PPV (%) | NPV (%) | US CPPVa (%) | Clinical MCIHb (%) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Erez, 1996 | 200 | 38 | 2 | 0 | 160 | 36–48 | 100 | 98.8 | 95.0 | 100 | 20.0 | 19.0 |
| Uno, 1992 | 32 | 4 | 1 | 0 | 27 | ≥ 12 | 100 | 96.4 | 80 | 100 | 15.6 | 12.5 |
| Zaidi, 2017 | 287 | 39 | 6 | 13 | 229 | ≤ 24 | 75.0 | 97.4 | 86.7 | 94.6 | 15.7 | 18.1 |
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, MCIH metachronous contralateral inguinal hernia
aAmount (%) of contralateral patent processus vaginalis as determined by ultrasonography
bAmount (%) of metachronous contralateral inguinal hernias that occurred during clinical follow-up