Fig. 2From: Systematic review and meta-analysis of lactose digestion, its impact on intolerance and nutritional effects of dairy food restriction in inflammatory bowel diseasesa Forest plot of 17 articles which evaluated indirect tests of lactose maldigestion in patients with inflammatory bowel diseases compared with controls. The 4 indirect tests were the hydrogen breath test, lactose tolerance test proximal small bowel biopsy and sugar urinary ratio test. b Forest plot of 11 studies evaluating only Crohn’s disease using all type of tests. c Forest plot of 11 studies evaluating only ulcerative colitis using all type of testsBack to article page