Table 2.

Pathological factors of 1622 PTC patients.

	BMI at diagnosis (kg/m2)				p value
	BMI < 18.5 N = 78	18.5 ≤ BMI < 23 N = 826	23 ≤ BMI < 27.5 N = 414	BMI ≥ 27.5 N = 304
Tumor size, cm, mean ± SD	0.9 ± 0.5	1.1 ± 0.5	1.3 ± 0.6	1.3 ± 0.5	0.12
Maximum tumor size, cm					0.14
<1 cm	48 (61.54%)	486 (58.83%)	267 (64.5%)	156 (51.32%)
≥1 cm	30 (38.46%)	340 (41.16%)	147 (35.5%)	148 (48.68%)
Multifocality	24 (30.77%)	263 (31.84%)	167 (40.34%)	129 (42.43%)	0.02
Bilateriality	21 (26.92%)	174 (21.07%)	96 (23.19%)	68 (22.36%)	0.49
Extrathyroidal extension	27 (34.62%)	287 (34.75%)	170 (41.06%)	141 (46.38%)	0.04
N1	28 (35.9%)	314 (38.01%)	163 (39.37%)	149 (49.01%)	0.045
N1a	19	176	118	83
N1b	9	138	45	66
M1	3 (3.85%)	14 (1.69%)	11 (2.68%)	6 (1.97%)	0.65
TNM stage					0.001
I + II	49	525	225	150
III + IV	29 (37.18%)	301 (36.44%)	189 (45.65%)	154 (50.66%)