Table 6.

The correlation between different IGF-1 concentrations and thyroid nodules incidence

	IGF-1 quartiles
	Q1: ≤84.34	Q2: 84.35–120.01	Q3: 120.02–222.30	Q4: ≥222.31
No.cases/subjects	79/99	85/100	73/100	52/99
Model 1	1.00(reference)	1.435(0.687,2.995)	0.827(0.595,1.151)	0.654(0.530,0.807)
Model 2	1.00(reference)	1.193(0.468,3.042)	0.709 (0.461,1.092)	0.783(0.607,1.010)
Model 3	1.00(reference)	1.274(0.491,3.3310)	0.756(0.484,1.181)	0.818(0.630,1.063)

Note: Model1 is unadjusted. Model 2 is adjusted for FBG, TC, TT3, TT4, hypertension. Model 3 is further adjusted for 25(OH)D3