Table 3.
Diagnostic performance of ultrasound for appendicitis with regard to gender, age group, and experience of examiner.
| Diagnostic performance% (95% CI) | LR+/LR− (95% CI) | ||||
|---|---|---|---|---|---|
| Sensitivity | Specificity | PPV | NPV | ||
| All patients | 82 (75–89) | 97 (94–99) | 92 (85–96) | 93 (90–96) | 28 (15–55)/0.18 (0.12–0.26) |
| Boys | 83 (72–91) | 98 (94–100) | 93 (84–99) | 92 (87–96) | |
| Girls | 80 (67–92) | 97 (94–99) | 91 (78–99) | 93 (89–98) | |
|
| |||||
| Age group (years) | |||||
| 0–4 | 74 (45–92) | 96 (84–100) | 92 (66–100) | 89 (75–96) | |
| 5–9 | 86 (71–95) | 100 (96–100) | 100 (89–100) | 95 (90–98) | |
| 10–14 | 81 (67–91) | 95 (90–99) | 88 (74–96) | 92 (87–95) | |
|
| |||||
| Examiner | |||||
| Pediatric radiologist | 88 (76–95) | 98 (93–100) | 94 (86–99) | 95 (90–99) | |
| Radiologist | 71 (56–84) | 97 (94–99) | 90 (74–98) | 91 (86–95) | |
PPV: positive predictive value; NPV: negative predictive value; CI: confidence interval; LR: likelihood ratio.