Fig. 2From: The efficacy of vitamin D supplementation for irritable bowel syndrome: a systematic review with meta-analysisForest plot of the differences in IBS-SSS scores between participants in the intervention group and placebo group before and after intervention. a The differences in IBS-SSS scores between participants in the intervention group and placebo group before intervention; b the differences in IBS-SSS scores between participants in the intervention group and placebo group after interventionBack to article page