TABLE 1.

Practice-level NP and practice characteristics (N = 1109 practices).

	Overall		Full SOP		Reduced SOP		Restricted SOP
	M	SD	M	SD	M	SD	M	SD	p
Practice-level NP characteristics
Average age	49.19	11.65	49.34	11.23	49.78	11.69	48.67	11.86	0.38
Average number of years in primary position	6.53	6.55	6.23	6.61	6.71	6.29	6.55	6.72	0.66
Practice-level NP ratio
Sex (female ratio)	0.88	0.28	0.86	0.27	0.91	0.25	0.87	0.30	0.06
Race (white ratio)	0.80	0.39	0.88	0.31	0.90	0.29	0.69	0.46	<0.01**
Education level (doctorate degree ratio)	0.12	0.31	0.17	0.36	0.10	0.30	0.10	0.29	<0.01**
Practice characteristics (practice level)	Overall		Full SOP		Reduced SOP		Restricted SOP		P
	N	%	N	%	N	%	N	%
Geographic location									0.30
Rural	158	14	41	15	43	12	74	15	-
Urban	951	86	228	85	318	88	405	85	-
Practice type									<0.01**
Community health center	222	20	58	22	44	12	120	25	-
Hospital-based practice	101	9	30	11	29	8	42	9	-
Physician practice	521	47	105	39	218	61	198	42	-
All other	254	23	74	28	64	18	116	24	-
Number of NPs									<0.01**
1	443	40	92	34	176	49	175	37	-
2–5	557	50	142	53	167	46	248	52	-
6+	109	10	35	13	18	5	56	12	-

Note: p-values generated from χ² tests for categorical and t-tests for continuous variables.

Abbreviations: M, mean; N, sample size; NP, nurse practitioner; p, p-value; SD, standard deviation; SOP, scope of practice.

^**Significant at p < 0.01.