Fig. 2From: Geo-epidemiology of autoantibodies in rheumatoid arthritis: comparison between four ethnically diverse populationsAMPA to IgG ratios in geographically and ethnically diverse RA populations. Ratios of levels in arbitrary units (aU/mL) for four AMPAs, per grams per liter (g/L) total IgG in the serum of four RA populations. Ratios are only shown in patients that were positive for the AMPA. Lines indicate median and interquartile range; p-values correspond to Mann–Whitney U tests. The range of aU/mL per g/L is not directly comparable between AMPAsBack to article page