Fig. 1.

An overview of trends in the published genetic association studies of sporadic immunoglobulin A nephropathy (IgAN): a Trends in the numbers of genetic association studies by publication year and ethnicity (data from 1994 to mid-2009); b proportions of published genetic associations by nationality of study cohorts; c trends in the average size of IgAN cohorts by publication year (mean ± standard error); and d number of cases and controls per study by ethnicity. Only studies that use DNA-based genotyping are included