Initial or concomitant diagnosis of differentiated thyroid cancer (papillary or follicular)
0.31
No
22
21 (95.5%)
Reference
Yes
6
5 (83.3%)
0.602 (0.224 - 1.617)
Lymphovascular invasion
0.76
No
5
5 (100.0%)
Reference
Yes
14
12 (85.7%)
0.846 (0.287 - 2.491)
Extrathyroidal extension
0.21
No
4
3 (75.0%)
Reference
Yes
23
22 (95.7%)
2.182 (0.649 - 7.340)
Leukocytosis
0.12
No
12
11 (91.7%)
Reference
Yes
12
11 (91.7%)
1.994 (0.833 - 4.773)
Patients with unknown values for a covariate were excluded from the respective univariate analysis. Counts and row percentages of deaths are presented for all covariates except for age. Hazard ratios and confidence intervals are from Cox proportional hazards models, with p-values calculated by Wald chi-square tests. HR = hazard ratio; CI = confidence interval; EBRT = external beam radiation therapy.