Table 3.
Independent clinical factors associated with successful cessation of thyrotropin suppression therapy and theirs results using cutoff values.
| Fail | Success | Odds Ratio (95% CI) | p Value | |
|---|---|---|---|---|
| Preoperative TSH (mIU/L) | <0.001 | |||
| ≤1.95* (n = 184, 50.7%) | 65 (35.3%) | 119 (64.7%) | Ref. | |
| >1.95* (n = 179, 49.3%) | 105 (58.7%) | 74 (41.3%) | 0.18 (0.12–0.29) | |
| Maintenance period of TST (months) | 0.001 | |||
| ≤41 † (n = 185, 51.0%) | 49 (26.5%) | 136 (73.5%) | Ref. | |
| >41 † (n = 178, 49.0%) | 121 (68.0%) | 57 (32.0%) | 0.44 (0.28–0.70) |
CI, confidence interval; Ref., reference; TSH, thyrotropin; TST, TSH suppression therapy. * p < 0.05, the optimum cut-off point for preoperative TSH was 1.95 mIU/L (area under the curve = 0.69) by using receiver operating characteristic curve analysis. † p < 0.05, the optimum cut-off point for maintenance period of TST was 41 months (area under the curve = 0.74) by using receiver operating characteristic curve analysis.