Fig. 3From: Assessment of causal link between psychological factors and symptom exacerbation in inflammatory bowel disease: a systematic review utilising Bradford Hill criteria and meta-analysis of prospective cohort studiesForest plot for the effect of depression on symptom exacerbation in IBD. Tools to measure depression: SCL Symptom Checklist Scale, CES-D Center for Epidemiological Studies Depression Scale, HADS Hospital Anxiety and Depression ScaleBack to article page