Table 3.

The association between perchlorate, iodine and thyroid tumors and nodular goiter by conditional logistic model

Variables	Total cases		NG		PTMC		PTC
	ORs (%95CI)	P-value	ORs (%95CI)	P-value	ORs (%95CI)	P-value	ORs (%95CI)	P-value
N (case/control)	184/184		72/72		46/46		66/66
Perchlorate	1.041 (1.017, 1.066)	0.001	1.034 (0.994, 1.074)	0.094	1.033 (0.996, 1.072)	0.084	1.058 (1.009, 1.110)	0.021
Iodine	1.000 (1.000, 1.000)	0.759	1.002 (0.998, 1.005)	0.303	1.000 (0.998, 1.001)	0.596	1.000 (0.999, 1.002)	0.518

Note: Perchlorate and iodine were corrected by urinary specific gravity (USG). Perchlorate, iodine, BMI, smoking, and drinking were included in the model. OR odds ratio, CI confidence interval, NG nodular goiter, PTMC papillary thyroid micro carcinoma, PTC papillary thyroid carcinoma, Total cases including NG, PTMC and PTC