Table 5.
Variance inflation factors (VIF) analysis through Stepwise variable Selection.
| Variables | Step 1 | Step 2 | Step 3 | Step 4 |
|---|---|---|---|---|
| Demographic Characteristics | ||||
| Age (years) | 1.1 | 1.1 | 1.1 | 1.1 |
| Clinical Stage | ||||
| Stage I | > 10.0 | 2.1 | 2.1 | 2.1 |
| Stage II | > 10.0 | NA | NA | NA |
| Stage III | > 10.0 | 3.1 | 3.1 | 3.1 |
| Stage IV | > 10.0 | 4.2 | 4.2 | 4.2 |
| Tumor Differentiation | ||||
| Well/Moderate | > 10.0 | > 10.0 | NA | NA |
| Poor | > 10.0 | > 10.0 | 1.3 | 1.3 |
| ECOG Performance Status | ||||
| 0–1 | > 10.0 | > 10.0 | > 10.0 | 1.4 |
| ≥ 2 | > 10.0 | > 10.0 | > 10.0 | NA |
| Laboratory Parameters | ||||
| Serum Albumin (g/L) | 2.2 | 2.2 | 2.2 | 2.2 |
| LMR | 1.3 | 1.3 | 1.3 | 1.3 |
| HRR | 1.3 | 1.3 | 1.3 | 1.3 |
| ALB/GLB | 1.9 | 1.9 | 1.9 | 1.9 |
Notes:1.Stepwise variable selection was performed using backward elimination with a VIF threshold of 5.0.2.Variables with VIF > 10.0 were considered to have severe multicollinearity and were candidates for removal.3.Final model (Step 4) achieved optimal variable selection with all VIF values < 5.0.4.Variables removed: Clinical stage (Stage II)、Differentiation grade (Well to moderate differentiation)、ECOG PS(≥ 2)0.5.Predictors used: Clinical stage (Stage I)、Clinical stage (Stage III)、Clinical stage (Stage IV)、Differentiation grade (Poor differentiation)、ECOG PS(0–1)、Serum albumin (g/L)、LMR、HRR、ALB/GLB、Age.