Table 3.

Relationship of Thyroid Stage to Serum Thyrotropin, Adjusting for Age and Sex

Stage	Geometric mean serum TSH (mU/L) [CI]	p
Age <45 years
I/II (n=275)	1.12 [0.90, 1.39]
III (n=16)	1.67 [0.79, 3.54]	0.29
Age ≥45 years
I/II (n=156)	0.95 [0.71, 1.28]
III/IV (n=168)	1.52 [1.18, 1.95]	0.01

Under the NTCTCS staging system, patients <45 years of age with distant metastases are classified as having Stage III disease. CI, 95% confidence interval.