Fig. 2From: Systematic review and meta-analysis of calculating degree of comorbidity of irritable bowel syndrome with migraineForest plot for comorbid migraine or headache in IBS patients. Odds ratio (OR, red small box) and 95% confidence interval (CI, horizontal bar) in 10 case–control and cross-sectional studies were plotted. Black diamond showed calculated value of OR and 95%CIBack to article page