Table 4. Comparison of the negative predictive value (NPV) for the absence of clinical disease (cN0 status) in each neck level and the positive predictive value (PPV) of cN+ve status in each neck level Table 4. Comparison of the negative predictive value (NPV) for the absence of clinical disease (cN0 status) in each neck level and the positive predictive value (PPV) of cN+ve status in each neck level Table 4. Comparison of the negative predictive value (NPV) for the absence of clinical disease (cN0 status) in each neck level and the positive predictive value (PPV) of cN+ve status in each neck level Table 4. Comparison of the negative predictive value (NPV) for the absence of clinical disease (cN0 status) in each neck level and the positive predictive value (PPV) of cN+ve status in each neck level Table 4. Comparison of the negative predictive value (NPV) for the absence of clinical disease (cN0 status) in each neck level and the positive predictive value (PPV) of cN+ve status in each neck level
Neck level NPV of cN0 (%) 95% CI PPV of cN+ve (%) 95% CI
I 100 na 75.0 30.1 – 95.4
II 41.7 22.9 – 63.2 94.1 86.7 – 97.5
III 86.7 77.0 – 92.7 66.7 47.0 – 81.2
IV 95.1 94.9 – 95.3 0§ na
V
100
na
50.0
– 87.5
§ No cN+ve level IV ND specimens returned pN+ve disease in level IV; all level IV pN+ve disease was occult (see Table 3) § No cN+ve level IV ND specimens returned pN+ve disease in level IV; all level IV pN+ve disease was occult (see Table 3) § No cN+ve level IV ND specimens returned pN+ve disease in level IV; all level IV pN+ve disease was occult (see Table 3) § No cN+ve level IV ND specimens returned pN+ve disease in level IV; all level IV pN+ve disease was occult (see Table 3) § No cN+ve level IV ND specimens returned pN+ve disease in level IV; all level IV pN+ve disease was occult (see Table 3)