KRT1 and hematocrit: There were associations of serum KRT1 with TSH levels in all, AITD, and GD subjects (r = -0.296, p < 0.001; r = -0.275, p = 0.001; r = -0.210, p = 0.020, Fig 4A–4C, respectively), but not in HT subjects (r = -0.184, p = 0.296, Fig 4D).