SLN status | ALN status | Total |
|---|
(+) | (–) |
|---|
(+) | 172 (a) | 0 (c) | 172 |
(–) | 19 (b) | 376 (d) | 395 |
Total | 191 | 376 | 567 |
- For SLNB, the FNR was \(\left( {\rm{b}} \right)/\left( {{\rm{a + b}}} \right) = 19\;\left( {172{\rm{ + 19}}} \right) = 9.9\%\). Sensitivity was \(\left( {\rm{a}} \right)\left/\,( {{\rm{a + b}}} \right) = 172\;\left( {172{\rm{ + 19}}} \right) = 90.1\%\). Accuracy rate was \({{\left( {{\text{a}}{\mathbf{ + }}{\text{d}}} \right)} \mathord{\left/ {\vphantom {{\left( {{\text{a}}{\mathbf{ + }}{\text{d}}} \right)} {\left( {{\text{a}}\text{ + }{\text{b}}{\mathbf{ + }}{\text{c}}{\mathbf{ + }}{\text{d}}} \right) = {{\left( {172\text{ + 376}} \right)} \mathord{\left/ {\vphantom {{\left( {172\text{ + 376}} \right)} {\left( {172{\mathbf{ + }}19{\mathbf{ + }}0{\mathbf{ + }}376} \right)}}} \right. \kern-0pt} {\left( {172{\mathbf{ + }}19{\mathbf{ + }}0{\mathbf{ + }}376} \right)}} = 96.6\% }}} \right. \kern-0pt} {\left( {{\text{a}}\text{ + }{\text{b}}{\mathbf{ + }}{\text{c}}{\mathbf{ + }}{\text{d}}} \right) = {{\left( {172\text{ + 376}} \right)} \mathord{\left/ {\vphantom {{\left( {172\text{ + 376}} \right)} {\left( {172{\mathbf{ + }}19{\mathbf{ + }}0{\mathbf{ + }}376} \right)}}} \right. \kern-0pt} {\left( {172{\mathbf{ + }}19{\mathbf{ + }}0{\mathbf{ + }}376} \right)}} = 96.6\% }}\). Negative predictive value was \({{\left( {\text{d}} \right)} \mathord{\left/ {\vphantom {{\left( {\text{d}} \right)} {\left( {{\text{b}}{\mathbf{ + }}{\text{d}}} \right)}}} \right. \kern-0pt} {\left( {{\text{b}}{\mathbf{ + }}{\text{d}}} \right)}} = {{376} \mathord{\left/ {\vphantom {{376} {\left( {19{\mathbf{ + }}376} \right)}}} \right. \kern-0pt} {\left( {19{\mathbf{ + }}376} \right)}} = 95.2\%\)
- Abbreviations: ALN axillary lymph node, SLNB sentinel lymph node biopsy, SLN sentinel lymph node, FNR false-negative rate
