Fig. 4
![Fig. 4](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs12937-022-00777-x/MediaObjects/12937_2022_777_Fig4_HTML.png)
Forest plot of the improvement of IBS-QoL after intervention in participants receiving vitamin D supplementation and receiving placebo. a The improvement of IBS-QoL in participants receiving vitamin D supplementation; b the improvement of IBS-QoL in participants receiving placebo