Fig. 4
![Fig. 4](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs12967-019-1802-x/MediaObjects/12967_2019_1802_Fig4_HTML.png)
a Correlation between mucosal oxygen saturation and the converted μPO2 saturation. R2 = 0.39, intercept 18.5 slope 0.41. b Blant–Altman plot of the mucosal oxygen saturation and the converted μPO2 saturation. VLS—μPO2_saturation: − 16.00974, 2.5% limit: − 52.83358, 97.5% limit: 20.81410, SD (diff): 18.41192