TABLE 1.
Primary Outcome Descriptive Data and MRI Diagnostic Performance a
| Any Meniscal Tear (n = 252) |
No Meniscal Tear (n = 154) |
Lateral Meniscus Tear (n = 198) |
Medial Meniscal Tear (n = 113) |
|
|---|---|---|---|---|
| Age, y, mean ± SD | 16.1 ± 1.5 | 15.7 ± 1.5 | 16.1 ± 1.4 | 16.1 ± 1.6 |
| Female sex | 117 (46.4) | 98 (63.6) | 82 (41.4) | 64 (56.6) |
| Obese | 41/236 (17.4) | 25/154 (16.2) | 29/187 (15.5) | 21/104 (20.2) |
| Hospital A patients | 113 (44.8) | 144 (93.5) | 95 (48.0) | 33 (29.2) |
| Hospital B patients | 139 (55.2) | 10 (6.5) | 103 (52.0) | 80 (70.8) |
| MRI diagnostic performance | ||||
| True positive, n | 189 | — | 101 | 94 |
| False negative, n | 63 | — | 97 | 19 |
| False positive, n | — | 43 | 28 | 57 |
| True negative, n | — | 111 | 180 | 236 |
| Sensitivity, % | 75.0 | — | 51.0 | 83.2 |
| Specificity, % | 72.1 | — | 86.5 | 80.6 |
| PPV, % | 81.5 | — | 78.3 | 62.3 |
| NPV, % | 63.8 | — | 65.0 | 92.5 |
a Data are reported as n (%) unless otherwise indicated. MRI, magnetic resonance imaging; NPV, negative predictive value; PPV, positive predictive value. Dashes indicate not applicable.