Table 3 –

Difference-in-Difference Marginal Associations Between Implementation of Full Practice Authority and Outcome for All Employed and Full-Time Nurse Practitioners

Dependent variable	Marginal Association with Implementation of FPA
All Employed (N = 9,782)	AOR/Coef†	95%CI		t	p
Located in/near HPSA	1.94	1.05	3.61	2.10	.036
Self-employed	2.86	0.90	9.11	1.77	.076
Log hourly earnings	0.08	−0.02	0.19	1.51	.132
Full-time employed (N = 7,880)	AOR/Coef†	95% CI		t	p
Located in/near HPSA	2.34	1.14	4.83	2.30	.021
Self-employed	4.97	1.00	24.86	1.95	.051
Log hourly earnings	0.08	−0.04	0.20	1.28	.201

^†The adjusted odds ratio is the coefficient of the interaction of being in a full practice authority state during the post implementation period.

Health professional shortage area (HPSA) is defined by criteria from the U.S. Health Resources and Services Administration to determine which zip-codes are in primary care health professional shortage areas. This data was linked to everyone’s residence.

Log hourly earnings are adjusted to 2018 dollars using the U.S. Consumer Price Index-All Urban Consumers (U.S. Bureau of Labor Statistics, 2019)

The LASSO regressions were adjusted for a yearly trend, the year before full practice authority was implemented, whether the state had implemented full practice authority by 2018, nurse practitioners per capita in 2010, an interaction between sex and age squared (self-employed only), sex (HPSA and wage only), registered nurses with a master’s degree in 2010 (HPSA only), residence in a metropolitan area (HPSA only), immigration status (HPSA only), an interaction between Asian race and living in a metro area (HPSA only), an interaction between nurse practitioners per capita and a living in a metro area (HPSA only), Asian race (HPSA only) and age (wage only).