Association between the Systemic Immune-Inflammation Index and Thyroid Function in U.S. Adults

Table 5

Association between lnSII and thyroid function after subgroup analysis by BMI.

Outcomes	≤18.5 kg/m^2	>18.5, ≤25.0 kg/m^2	>25.0, ≤30.0 kg/m^2	>30 kg/m^2	p for interaction
	β (95% CI), p-value
FT3	0.0243 (−0.1145, 0.1631)	−0.0277 (−0.0708, 0.0153)	−0.1536 (−0.1948, −0.1125)	−0.0417 (−0.0822, −0.0012)	<0.001
TT4	0.1705 (−0.2478, 0.5889)	0.1603 (0.0306, 0.2899)	0.1939 (0.0699, 0.3179)	0.0857 (−0.0364, 0.2078)	0.659
FT3/FT4	0.0235 (−0.2805, 0.3276)	−0.0554 (−0.1496, 0.0388)	−0.2245 (−0.3146, −0.1344)	−0.0588 (−0.1475, 0.0299)	0.021
TG	−1.1853 (−12.1406, 9.7699)	0.1532 (−3.2409, 3.5472)	−1.2561 (−4.5032, 1.9909)	5.1916 (1.9946, 8.3887)	0.031

Note: FT3, free triiodothyronine; FT4, free thyroxine; TT3, total triiodothyronine; TT4, total thyroxine; TG, thyroglobulin; and TGAb, thyroglobulin antibodies. , , . Bold values signify the statistically significant variables clearly distinguishable from those that are not.