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Cox Proportional Hazards Model
| Variable | Hazard Ratio | 95% C.I. | p value |
|---|---|---|---|
| Age | 1.09 | 1.07–1.11 | < 0.01 |
| Male gender | 0.78 | 0.39–1.55 | 0.48 |
| Size | 1.01 | 1.00–1.02 | 0.01 |
| Lymph node ratio (LNR) | 4.33 | 1.68–11.18 | < 0.01 |
| # Positive lymph nodes | 1.03 | 0.97–1.09 | 0.32 |
| # Negative lymph nodes | 1.05 | 1.03–1.07 | < 0.01 |
| Radioactive iodine ablation | 0.84 | 0.44–1.61 | 0.59 |
C.I. = confidence interval. Extrathyroidal extension and unfavorable histology were also included in the model but dropped because of collinearity.
