Fig. 6
![Fig. 6](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs12917-021-02890-1/MediaObjects/12917_2021_2890_Fig6_HTML.png)
a Serum cortisol concentrations of the four groups. The horizontal line represents the median of each group. b Correlation between serum and baseline salivary cortisol concentration
a Serum cortisol concentrations of the four groups. The horizontal line represents the median of each group. b Correlation between serum and baseline salivary cortisol concentration