Figure. Correlation of the rate of parenteral vancomycin (defined daily doses per 1000 patient-days) and the prevalence of vancomycin-resistant enterococci (percentage of enterococci that are vancomycin resistant) in 126 intensive care units.P values were determined for the Spearman correlation coefficient (r = 0.44 [95% CI, 0.29 to 0.57]) and weighted linear regression (parameter estimate = 0.08; P = 0.001).