Table 2.

Linear regression analysis of preoperative serum calcitonin (pg/mL, log-transformed) and the indicated factors.

Characteristic	Unadjusted		Adjusted
	b ± SE	p Value	b ± SE	p Value
Sex (female)	0.137 ± 0.103	0.188
Age at diagnosis (years)	0.006 ± 0.004	0.083
Primary tumor size	0.328 ± 0.035	<0.001	0.327 ± 0.035	<0.001
Nodal metastasis above N1b	0.529 ± 0.121	<0.001	0.472 ± 0.118	<0.001
Positive extrathyroidal extension	0.265 ± 0.131	0.045	0.257 ± 0.131	0.050
Positive resection margin	−0.057 ± 0.457	0.901
Tumor type (sporadic/hereditary)	0.239 ± 0.134	0.076

SE = standard error.