Table 5.

Univariate and multivariate survival analyses, for various clinical-pathological characteristics and treatment characteristics of the elderly PTMC patients.

Variable	Number	Univariate analysis		Multivariate analysis
		Log rank x2 test	P value	HR(95% CI)	P value
Gender		13.906	<0.001
Female	1123			Reference
Male	3685			0.440 (0.234-0.828)	0.011
Surgery		28.259	<0.001
No surgery	29			Reference
Lobectomy	1318			0.057 (0.011-0.297)	0.001
Total thyroidectomy	3463			0.058 (0.013-0.261)	<0.001
Radiotherapy		23.282	<0.001
Yes	1030			Reference
No	3720			0.620 (0.282-1.310)	0.204
TNM stage		90.308	<0.001
I-II	4174			Reference
III-IV	517			8.064 (3.765-17.271)	<0.001

PTMC, papillary thyroid microcarcinoma

HR, hazard ratio

TNM, tumor-node-metastasis