Regarding thyroid parameters, both groups significantly differed with regard to z-standardized TSH (p < 0.001, d = 0.82; lower in TPOonly), TPO-AB titers (p < 0.001, d = 0.27; lower in TPOonly) as well as the frequency of a previously physician-diagnosed thyroid disease (pFisher′s exact test < 0.001, d = 2.14), the frequency of levothyroxine prescription pFisher′s exact test < 0.001, d = 1.86), and structural irregularities on thyroid ultrasonography pFisher′s exact test < 0.001, d = 1.11). This evidence concerns the gene TPO and thyroid gland disorder.