Table 2.
An example of real data showing sensitivity and specificity at various cut- off points of BMI for detection of breast cancer
| Cut-off values of BMI (kg/m2) | Breast cancer (n=100) |
Normal subjects (n=200) |
Sensitivity | Specificity | ||
|---|---|---|---|---|---|---|
|
True positive
(TP) |
False negative (FN) |
False positive
(FP) |
True negative (TN) | |||
| 18 20 22 24 26 28 30 32 34 36 38 40 |
100 100 99 95 85 66 47 34 21 17 7 1 |
0 0 1 5 15 34 53 66 79 83 93 99 |
200 198 177 117 80 53 27 17 14 6 4 1 |
0 2 23 83 120 147 173 183 186 194 194 199 |
1.0 1.0 0.99 0.95 0.85 0.66 0.47 0.34 0.21 0.17 0.07 0.01 |
0.0 0.01 0.115 0.415 0.60 0.735 0.865 0.915 0.93 0.97 0.98 0.995 |