Table 2.

Effect of urinary iodine concentration on thyroid nodule according to the iodine nutritional status evaluation criteria of the WHO.

Group	UIC (μg l−1)	Model 1a		Model 2b		Model 3c		Model 4d
		OR (95% CI)	p	OR (95% CI)	p	OR (95% CI)	p	OR (95% CI)	p
All	<100	1.00		1.00		1.00		1.00
	100–199	0.75 (0.58–0.97)	0.03	0.75 (0.58–0.97)	0.03	0.78 (0.61–1.01)	0.06	0.79 (0.61–1.03)	0.08
	200–299	0.54 (0.39–0.75)	0.00	0.54 (0.39–0.75)	0.00	0.62 (0.44–0.87)	0.01	0.63 (0.45–0.88)	0.01
	≥300	0.50 (0.34–0.76)	0.00	0.51 (0.34–0.77)	0.00	0.61 (0.40–0.92)	0.02	0.62 (0.41–0.94)	0.03
Male	<100	1.00		1.00		1.00		1.00
	100–199	0.83 (0.56–1.23)	0.34	0.82 (0.55–1.22)	0.33	0.84 (0.56–1.25)	0.38	0.84 (0.56–1.25)	0.39
	200–299	0.55 (0.34–0.91)	0.02	0.55 (0.34–0.91)	0.02	0.63 (0.38–1.04)	0.07	0.63 (0.38–1.04)	0.07
	>300	0.67 (0.37–1.20)	0.18	0.68 (0.38–1.21)	0.19	0.84 (0.47–1.52)	0.57	0.85 (0.47–1.53)	0.58
Female	<100	1.00		1.00		1.00		1.00
	100–199	0.71 (0.51–0.98)	0.04	0.71 (0.51–0.98)	0.04	0.75 (0.54–1.05)	0.09	0.77 (0.55–1.07)	0.12
	200–299	0.54 (0.35–0.83)	0.01	0.54 (0.35–0.84)	0.01	0.62 (0.40–0.97)	0.04	0.63 (0.40–0.98)	0.04
	≥300	0.39 (0.22–0.70)	0.00	0.40 (0.22–0.70)	0.00	0.46 (0.25–0.82)	0.01	0.47 (0.26–0.85)	0.01

^aAdjusted for gender, age (continuous variable), education, and profession.^bAdditionally adjusted for hypertension.^cAdditionally adjusted for BMI, waist circumference, FBG, OTGG-2h, HbA1c, TC, LDL-C, and UA.^dAdditionally adjusted for TSH and TGAb.