Table 3. Comparison of anthropometric and biochemical parameters in T1 (T1a and T1b) and >T1 (T2, T3, and T4) patients with papillary thyroid carci-noma.

Variable	Tumor size category		P-value
	T1 (n=112)	>T1 (n=70)
Sex, female	94 (83.9)	51 (72.9)	0.071
Age (years)	34.28±10.92	37.33±12.94	0.090
BMI (Kg/m2)	24.48±3.68	24.69±4.27	0.720
FT4 (ng/dl)	1.31±0.23	1.27±0.28	0.317
FT3 (pg/ml)	3.58±0.63	3.59±0.55	0.961
TSH (mIu/L)	2.44±1.10	2.64±0.99	0.212
Selenium (µg/l)	99.17±17.10	88.30±22.25	<0.001
Selenium deficiency (<70)	2 (1.8)	22 (31.4)	<0.001

Data are shown as number (%) or mean±SD. P-values were determined by independent t-test, Pearson χ2 test or Fisher's exact test.

BMI: Body mass index; FT4: Free thyroxin; FT3: Free triiodothyronine; TSH: thyroid stimulating hormone.