PURPOSE The aim of this study was to assess whether the quality of diabetes care differs among practices employing nurse-practitioners (NPs), physician's assistants (PAs), or neither, and which practice attributes contribute to any differences in care.METHODS This cross-sectional study of 46 family medicine practices from New Jersey and Pennsylvania measured adherence to American Diabetes Association diabetes guidelines via chart audits of 846 patients with diabetes. Practice characteristics were identifi ed by staff surveys. Hierarchical models determined differences between practices with and without NPs or PAs.
RESULTSCompared with practices employing PAs, practices employing NPs were more likely to measure hemoglobin A 1c levels (66% vs 33%), lipid levels (80% vs 58%), and urinary microalbumin levels (32% vs 6%); to have treated for high lipid levels (77% vs 56%); and to have patients attain lipid targets (54% vs 37%) (P ≤.005 for each). Practices with NPs were more likely than physician-only practices to assess hemoglobin A 1c levels (66% vs 49%) and lipid levels (80% vs 68%) (P ≤.007 for each). These effects could not be attributed to use of diabetes registries, health risk assessments, nurses for counseling, or patient reminder systems. Practices with either PAs or NPs were perceived as busier (P = .03) and had larger total staff (P <.001) than physician-only practices.CONCLUSIONS Family practices employing NPs performed better than those with physicians only and those employing PAs, especially with regard to diabetes process measures. The reasons for these differences are not clear. Ann Fam Med 2008;6:14-22. DOI: 10.1370/afm.758.
INTRODUCTIONI ncreasingly, nurse-practitioners (NPs) and physician's assistants (PAs) serve as a primary point of contact for patients within primary care practices.1,2 Bolstering this trend is the development of new models of primary care practice advocating collaborative teams of diverse clinicians.3-5 Yet, among family physicians, some uncertainty and unease persists about the use of these clinicians, [6][7][8] particularly with regard to quality of care, 9,10 patient satisfaction, 11,12 and fi nancial effi ciency. 13,14 Most randomized clinical trials and observational studies have focused on comparing the quality of care between physicians and NPs, with relatively little published research comparing PAs with either physicians or NPs. 9,[15][16][17][18] For example, in a study comparing NP and physician performance in the care and attainment of outcomes for patients with diabetes, Lenz et al 19 found signifi cant differences in documentation but not in patient outcomes. Some have argued that NPs may enhance primary care because they are trained specifi cally for health promotion and education. 2,20,21 In fact, Hopkins et al 22 found that compared with physicians, NPs performed better at secondary prevention, assessment, and counseling.
QU A L I T Y O F DIA BE T ES C A R E W I T H NP s A ND PA sSakr et al 16 found that patients cared for by NPs received more inf...