Table II. Factors predictive of disease-specific survival by univariate analysis.
| Variable | n (%) | 5-y DSS | Univariate P value |
|---|---|---|---|
| Age | |||
| <45 | 45 (29%) | 100% | .001 |
| ≥45 | 108 (71%) | 83% | |
| Sex | |||
| Female | 89 (58%) | 90% | .625 |
| Male | 64 (42%) | 86% | |
| Operation | |||
| Less than total | 13 (8%) | 90% | .913 |
| Total thyroid | 140 (92%) | 88% | |
| R status | |||
| R0 | 70 (46%) | 94% | .030 |
| R1 | 63 (41%) | 88% | |
| R2 | 20 (13%) | 68% | |
| Neck dissection | |||
| None | 45 (29%) | 83% | .484 |
| Central | 27 (18%) | 90% | |
| Lateral | 81 (53%) | 89% | |
| pT size | |||
| ≤4 cm | 115 (74%) | 94% | .024 |
| >4 cm | 37 (25%) | 72% | |
| pN status | |||
| N0/NX | 31 (20%) | 75% | .887 |
| N1a | 43 (28%) | 98% | |
| N1b | 79 (52%) | 88% | |
| M status | |||
| M0 | 130 | 97% | <.001 |
| M1 | 23 | 47% | |
| RAI therapy | |||
| No | 17 (11%) | 80% | .613 |
| Yes | 136 (89%) | 89% | |
| EBRT | |||
| No | 135 (88%) | 87% | .852 |
| Yes | 18 (12%) | 94% | |
pN, Pathologic nodal; pT, pathologic tumor.