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Table 4 Multiple linear regression between perchlorate, iodine and thyroid function indicators in the control group

From: The risk of perchlorate and iodine on the incidence of thyroid tumors and nodular goiter: a case-control study in southeastern China

Indicators Perchlorate Iodine
β (%95CI) P-value β (%95CI) P-value
TSH 0.045 (−0.043, 0.13) 0.322 −0.021 (− 0.067, 0.025) 0.370
TT3 0.0018 (− 0.037, 0.040) 0.929 −0.0083 (− 0.029, 0.012) 0.422
TT4 1.74 (− 0.82, 4.29) 0.185 − 0.37 (−1.71, 0.97) 0.588
FT3 −0.067 (− 0.12, − 0.013) 0.016 − 0.0043 (− 0.033, 0.024) 0.768
FT4 0.018 (− 0.0048, 0.040) 0.125 0.0067 (− 0.0051, 0.019) 0.268
TPOAb 0.014 (− 0.20, 0.23) 0.900 − 0.0077 (− 0.12, 0.11) 0.895
TgAb 0.15 (0.0053, 0.30) 0.044 −0.0075 (− 0.085, 0.071) 0.851
  1. Note: Perchlorate and iodine were corrected by urinary specific gravity (USG); Perchlorate, iodine, gender, age, BMI, smoking, and drinking were included in the model. Perchlorate, iodine, TSH, TPOAb and TgAb were natural logarithm conversion. CI confidence interval, TSH thyroid stimulating hormone, TT3 triiodothyronine; TT4 thyroxine, FT3 free triiodothyronine, FT4 free thyroxine, TPOAb thyroid peroxidase antibody, TgAb thyroglobulin antibody