Table 3 Dose cutpoint, sensitivity, specificity and positive likelihood ratio, positive predictive value (PPV), negative predictive value (NPV) and relative risk (RR)
| Â | Mean dose cutpoint (cGy) | Number (%) of aspirators above cutpoint (sensitivity) | Number (%) of non-aspirators below cutpoint (specificity) | Positive likelihood ratio: sensitivity/(100-specificity) | PPV(%)a | NPV(%)b | RRc |
|---|---|---|---|---|---|---|---|
Structure | |||||||
 AE Folds | 6500 | 9/10 (90.0) | 13/19 (68.4) | 2.81 | 60.0 | 92.9 | 8.4 |
 Arytenoids | 6000 | 8/10 (80.0) | 14/19 (73.7) | 3.04 | 61.5 | 87.5 | 4.9 |
 Glossoepiglottic fold | 7000 | 10/10 (100.0) | 8/19 (42.1) | 1.73 | 47.6 | 100.0 | undefined |
 Cricoid cartilage | 6000 | 7/10 (70.0) | 14/19 (73.7) | 2.66 | 58.3 | 82.4 | 3.3 |
 Thyroid cartilage | 6450 | 9/10 (90.0) | 14/19 (73.7) | 3.42 | 64.3 | 93.3 | 9.6 |
 Epiglottis | 7225 | 7/10 (70.0) | 14/19 (73.7) | 2.66 | 58.3 | 82.3 | 3.3 |
 Suprahyoid epiglottis | 6810 | 10/10 (100.0) | 9/19 (47.4) | 1.90 | 50.0 | 100.0 | undefined |
 Infrahyoid epiglottis | 6300 | 9/10 (90.0) | 12/19 (63.2) | 2.45 | 56.3 | 92.3 | 7.3 |
 Total larynx | 6100 | 9/10 (90.0) | 13/19 (68.4) | 2.85 | 60.0 | 92.9 | 8.5 |
 Supraglottic larynx | 6650 | 9/10 (90.0) | 13/19 (68.4) | 2.85 | 60.0 | 92.9 | 8.5 |
 Subglottic larynx | 5750 | 7/10 (70.0) | 13/19 (68.4) | 2.66 | 53.9 | 81.3 | 2.9 |
 Glottic larynx | 6100 | 8/10 (80.0) | 14/19 (73.7) | 2.81 | 61.5 | 87.5 | 4.9 |