Employment of mid-level providers in primary care and control of diabetes.

AIMS: Examine potential associations between inclusion of mid-level providers in United States Veterans Affairs (VA) primary care programs and diabetes control. METHODS: We established a cohort of diabetes patients (alive October 1, 1999) using the VA Diabetes Registry and VA corporate databases. 1999 VA Survey of Primary Care Practices data were combined with individual-patient information. We used a two-level hierarchical model to determine the relationship between staffing characteristics and hemoglobin A1c (HbA1c), among 88,682 patients from 198 clinics. RESULTS: Inclusion of nurse practitioners (NPs) at relatively limited levels (% of all providers who are NPs) in the primary care program was significantly associated with HbA1c lower by 0.31 percentage points (95% CI, -0.50% to -0.12%) compared to programs that did not include NPs. Having some level of NP staffing vs. no NP staffing was associated HbA1c lower by 0.25%. Inclusion of physician assistants (PAs) in primary care programs was generally not associated with a statistically significant difference in HbA1c. The exception is that moderate levels of PA staffing were associated with slightly higher HbA1c [0.18%, 95% CI, 0.02-0.34)]. CONCLUSIONS: Diabetes control among primary care patients appeared to benefit from inclusion of NPs, while an analogous association was not found for PAs.

Duke Scholars

Author George Lee Jackson Population Health Sciences

Author David Edward Edelman Medicine, General Internal Medicine