Volume 52 | Number S1 | February 2017

Abstract List

Ellen T. Kurtzman Ph.D., M.P.H., R.N., F.A.A.N., Burt S. Barnow Ph.D., Jean E. Johnson Ph.D., R.N., F.A.A.N., Samuel J. Simmens Ph.D., Donna Lind Infeld Ph.D., Fitzhugh Mullan M.D.


To examine the impact of state‐granted nurse practitioner () independence on patient‐level quality, service utilization, and referrals.

Data Sources/Study Setting

The National Ambulatory Medical Care Survey's community health center () subsample (2006–2011). Primary analyses included approximately 6,500 patient visits to 350 s in 220 s.

Study Design

Propensity score matching and multivariate regression analysis were used to estimate the impact of state‐granted independence on each outcome, separately. Estimates were adjusted for sampling weights and ’s complex design.

Data Collection/Extraction Methods

Every “‐patient visit unit” was isolated using practitioner and patient visit codes and, using geographic identifiers, assigned to its state‐year and that state‐year's level of NP independence based on scope of practice policies. Nine outcomes were specified using ‐9 codes, standardized drug classification codes, and survey items.

Principal Findings

After matching, no statistically significant differences in quality were detected by states’ independence status, although visits in states with prescriptive independence received more educational services ( 1.66; 95 percent 1.09–2.53; =.02) and medications ( 1.26; 95 percent 1.04–1.53; =.02), and visits in states with practice independence had a higher odds of receiving physician referrals ( 1.88; 95 percent 1.10–3.22; =.02) than those in restricted states.


Findings do not support a quality–scope of practice relationship.