The Forest plot of odds ratios of contrast-induced nephropathy. Sizes of data markers are proportional to the weight of each study in the meta-analysis. Studies are stratified by year of presentation and/or publication. Horizontal bars, 95% confidence interval. NaHCO3 = sodium bicarbonate; NS = normal saline.
Meier et al. BMC Medicine 2009 7:23 doi:10.1186/1741-7015-7-23