Forest plots depicting risk ratios for familial autoimmunity in probands with T1D and RA. The figure shows two different analyses. From top to bottom: type 1 diabetes mellitus (A) and rheumatoid arthritis (B). The summary effect (random effect model) is depicted as a diamond at the bottom of each analysis, the lateral points of which indicate confidence intervals for this estimate. aNumbers in the study name represent different subgroups within the study. RA, rheumatoid arthritis; T1D, type 1 diabetes.