Figure 1.

Quality of care for beneficiaries with cardiovascular disease or diabetes by race and size of provider group. Performance on six quality measures (Panels A–F) are displayed by provider group size and race. Compared with small provider groups, racial differences in LDL cholesterol testing (Panel B) and retinal exams (Panel C) were significantly smaller for large groups (P ≤ 0.01) as a result of higher rates for black beneficiaries with diabetes, but racial differences in other quality measures did not differ by group size. Compared with small groups, both medium-sized and large groups performed better on all process measures for both white and black beneficiaries (P ≤ 0.01) but did not have lower rates of hospitalization for ACSCs. ACSC = ambulatory care sensitive condition; DM = diabetes mellitus; CVD = cardiovascular disease; LDL = low-density lipoprotein.