Table 3: Correlations of serums TSH, T3, and fT4 with oxidative stress biomarkers in the whole population before and after controlling for total cholesterol (TC) levels.

BiomarkersTSHT3fT4
BeforeAfterBeforeAfterBeforeAfter

TBARS, nmol MDA/mL0.7340.0000.1490.497−0.1370.5220.0340.875−0.0080.9690.2170.319
CAT, U/g Hb0.4990.0040.0360.870−0.2780.124−0.1530.485−0.2690.137−0.1210.580
SOD, U/mg Hb0.3300.0650.0610.781−0.1060.5660.0840.7020.0140.9380.1690.440

P < 0.05 was considered statistically significant. TSH: thyroid-stimulating hormone; T3: triiodothyronine; fT4: free thyroxine; TBARS: thiobarbituric acid reactive substances; CAT: catalase; SOD: superoxide dismutase.