Forest plot of risk ratio with its 95% CI for the incidence of contrast-induced nephropathy among patient taking statin versus control based on renal impairment status (with renal Impairment vs without renal impairment). Forest plot of risk ratio with its 95% CI for the incidence of contrast-induced nephropathy among patient taking statin versus control based on renal impairment status (with renal Impairment vs without renal impairment). Nirmal Singh et al. Open Heart 2014;1:e000127 ©2014 by British Cardiovascular Society