Forest plots depicting risk ratios for familial autoimmunity in probands with AITD and MS. The figure shows two different analyses. From top to bottom: autoimmune thyroid disease (A) and multiple sclerosis (B). The summary effect (random effect model) is depicted as a diamond at the bottom of each analysis. The lateral points of each diamond indicate confidence intervals for this estimate. aNumbers in the study name represent different subgroups within the study. AITD, autoimmune thyroid disease; MS, multiple sclerosis.