Table 2.

TSH and fT4 levels in the study population according to BMI stratified in 5 classes.

		N° of patients	TSH (mIU/L) (mean ± SD)	fT4 (pg/mL) (mean ± SD)
BMI stratification classes	1: BMI ≤ 34.9	366	1.95 ± 1.08	11.85 ± 1.72
	2: 34.9<BMI ≤ 39.9	1054	1.98 ± 1.18	11.64 ± 1.75
	3: 39.9<BMI ≤ 49.9	2646	2.10 ± 1.21	11.50 ± 1.73
	4: 49.9<BMI ≤ 59.9	753	2.23 ± 1.23	11.40 ± 1.72
	5: BMI>59.9	190	2.17 ± 1.18	11.44 ± 1.56
p-value (repeated measures ANOVA)			<0.0001	<0.0001

Data are expressed as mean ± SD. Comparison across BMI strata was performed by using repeated measures ANOVA with Hyun-Feldt correction as appropriate. Significant differences are shown in bold characters.

BMI, body mass index; fT4, free thyroxine; TSH, thyroid-stimulating hormone.