Table 1. Clinicopathological information of patients with papillary thyroid cancer.

Item	Number of cases	Number of cases with loss of differentiation	χ2 value	P value
Gender			0.461	0.497
Male	13	5
Female	32	9
Age (years)			0.353	0.553
<45	13	5
≥45	32	9
Clinical stage			7.106	0.008
I–II	26	4
III–IV	19	10
Lymph node metastasis			11.029	0.001
Anterior lymph node metastasis only	23	2
Regional lymph node metastasis	22	12
Size of mass (cm)			11	0.001
≤2	26	3
>2	19	11