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. Author manuscript; available in PMC: 2017 Sep 5.
Published in final edited form as: Ann Intern Med. 2016 Jun 21;165(4):237–244. doi: 10.7326/M15-2152

Appendix Table 4.

Unadjusted Proportions of Utilization, by Clinician Type, in the NHAMCS Only*

Variable Physician
(Reference)
(n = 13 359)		 Nurse
Practitioner
Only
(n = 1400)		 P Value Nurse
Practitioner
and Physician
(n = 191)		 P Value Physician
Assistant Only
(n = 1130)		 P Value Physician
Assistant
and
Physician
(n = 204)		 P Value
Antibiotics 2233/4742 (51.6) 335/637 (55.5) 0.35 28/64(48.4) 0.66 271/516(53.0) 0.73 31/64 (47.4) 0.66
CT/MRI 639/8666 (8.5) 41/771 (6.7) 0.38 12/128(18.3) 0.057 27/641 (7.0) 0.51 7/140(4.9) 0.20
Radiography 1390/11 015 (13.2) 140/1153 (11.9) 0.52 27/159(17.7) 0.30 102/964(9.8) 0.040 30/160(15.9) 0.46
Referral to other physician 2546/13 359 (18.4) 267/1400 (22.6) 0.46 53/191 (33.6) 0.017 207/1152 (17.7) 0.81 55/204 (25.9) 0.146

CT = computed tomography; MRI = magnetic resonance imaging; NHAMCS = National Hospital Ambulatory Medical Care Survey.

*

Values are sample numerator/sample denominator (percentages). Proportions may not match percentages because the percentages represent national estimates based on population weighting. Boldface values indicate comparisons with P < 0.05.