Table 3.
Association between imaging and disease specific survival in thyroid cancer
| Characteristic | Disease specific survival | |
|---|---|---|
| Adjusted hazard ratio (95% CI) | P | |
| Neck ultrasound | ||
| No | 1 (reference) | 0.087 |
| Yes | 1.14 (0.98 to 1.27) | |
| Radioiodine (iodine 131) scan | ||
| No | 1 (reference) | <0.001 |
| Yes | 0.70 (0.60 to 0.82) | |
| PET scan | ||
| No | 1 (reference) | 0.25 |
| Yes | 0.91 (0.77 to 1.07) | |
Analysis based on patients with complete set of information (n=22 770). Adjusted hazard ratios and 95% confidence interval based on propensity score analyses. Propensity scores obtained from first step model that included age, sex, race, education, income, stage of disease, histology, tumor size, surgery type, and lymph nodes resection as covariates. Cox proportional hazards regression used as second step model.