Table 3.

Associations of serum TSH, fT3, and fT4 levels with (pre)diabetes groups in the pooled population not taking l-thyroxine (n  = 3719).

(Pre)diabetes groups	TSH, mIU/L, β (95% CI)	fT3, mIU/L, β (95% CI)	fT4, mIU/L, β (95% CI)
Multinomial logistic regression: relative risk ratio (95% CI)
NGT	Base outcome	Base outcome	Base outcome
i-IFG	0.96 (0.88, 1.04)	1.09 (1.02, 1.18)a	0.94 (0.89, 0.98)a
i-IGT	1.04 (0.99, 1.10)	1.00 (0.89, 1.14)	1.02 (0.95, 1.10)
IFG + IGT	0.96 (0.84, 1.09)	1.09 (0.99, 1.20)	1.05 (0.98, 1.13)
Unknown diabetes	0.97 (0.83, 1.12)	1.05 (0.90, 1.22)	1.09 (1.01, 1.19)a

Analyses are adjusted for age, sex, smoking status, BMI, and study.

^aP  < .05.

i-IFG impaired fasting glucose; i-IGT impaired glucose tolerance; NGT, normal glucose tolerance.