(b).

	SPINA-GD		SPINA-GT		TSHI		TTSI
	B (95% CI)	P	B (95% CI)	P	B (95% CI)	P	B (95% CI)	P
Factor 1	0.209 (-0.051, 0.469)	0.115	0.043 (0.007, 0.079)	0.018	-0.062 (-0.114, -0.011)	0.017	-0.060 (-0.110, -0.010)	0.019
Factor 2	-0.424 (-1.603, 0.756)	0.481	-0.144 (-0.306, 0.018)	0.082	0.163 (-0.068, 0.395)	0.166	0.177 (-0.050, 0.404)	0.126
Factor 3	0.083 (-0.153, 0.319)	0.489	0.022 (-0.010, 0.055)	0.180	-0.020 (-0.066, 0.026)	0.393	-0.024 (-0.069, 0.022)	0.309
Factor 4	0.122 (-0.117, 0.362)	0.315	-0.007 (-0.040, 0.026)	0.684	-0.006 (-0.053, 0.041)	0.795	-0.002 (-0.048, 0.044)	0.920

Adjusted for age, sex, BMI, smoking status, and urine iodine to creatinine ratio and Factors 1, 2, 3, and 4. Factor 1 was highly loaded with MECPP, MEHHP, MEOHP, MCMHP, and MiNP. Factor 2 was highly loaded with MiBP, MnBP, and MEHP. Factor 3 was highly loaded with MCPP and MCHP, and Factor 4 was highly loaded with MBzP.