There were 314 primary care providers (16.0%) who had significantly lower rates, and they had a mean rate of 6.1% (95% CI, 5.9% to 6.3%).27% of the variance in whether a man received a PSA screening was explained by which primary care provider he saw, compared to patient characteristics such as age or comorbidity, which explained only 3.7% of the variance???a nearly 7-fold difference, the research