Table 2.
Results of the logistic regression
| Variables | β value | OR | 95% CI | P | Points |
|---|---|---|---|---|---|
| Age (years) | |||||
| < 61 vs. ≥ 61 | 0.179 | 1.196 | 0.910–1.572 | 0.199 | NA |
| Gender | |||||
| Female vs. male | 0.866 | 2.376 | 1.751–3.225 | < 0.001 | 3 vs. 0 |
| Pathology | |||||
| AC vs. non‐AC | 2.401 | 10.98 | 6.535–18.52 | < 0.001 | 8 vs. 0 |
| Smoking history | |||||
| No vs. yes | 0.350 | 1.419 | 1.001–2.030 | 0.046 | 1 vs. 0 |
| N stage | |||||
| N+ vs. N0 | 0.290 | 1.337 | 1.018–1.761 | 0.039 | 1 vs. 0 |
| M stage | |||||
| M1 vs. M0 | 0.357 | 1.429 | 1.067–1.916 | 0.017 | 1 vs. 0 |
| Brain metastasis | |||||
| Yes vs. no | 0.781 | 2.183 | 1.361–3.413 | 0.001 | 3 vs. 0 |
| Cyfra 21–1 (ng/mL) | |||||
| <3.3 vs. ≥3.3 | 0.661 | 1.937 | 1.385–2.710 | < 0.001 | 2 vs. 0 |
The assignment of points to the variables was based on a linear transformation to their corresponding β regression coefficients. The coefficient of each variable was divided by 0.290 (the lowest β value in the model) and rounded to the nearest integer. AC, adenocarcinoma; CEA, carcinoembryonic antigen; CI, confidence interval; OR, odds ratio.