Figure 1
From: Gender-specific regulation of response to thyroid hormone in aging
Frequency distribution of serum free T4 concentration and log-linear relationship of the serum concentration between of free T4 and of TSH in this study. (a) Frequency distribution of serum free T4 concentration. The gray column represents 2519 samples with TSH ranging from 0.04 to 9.99 selected from the total of 3564 samples. (b) The relationship between [FT4] and log[TSH]. The line represents the linear regression fitted to the data points using SPSS software.