. Author manuscript; available in PMC: 2015 Jun 1.

Published in final edited form as: Am J Med. 2014 Feb 8;127(6):512–518.e1. doi: 10.1016/j.amjmed.2014.01.024

Table 3.

Analysis of Tertiary Outcome Measures in the Study Cohort^A

Outcome Measure	Pre-Intervention	Post-Intervention	% Change	p-value
Lumbar Spine MRI ordered by any outpatient providers within 30 days of index primary care visit	753 (8.9%)	1009 (7.8%)	−12.3%	0.0023^*
Lumbar Spine MRI ordered by specialty clinics within 30 days	188 (2.2%)	352 (2.7%)	+22.7%	0.0292^*
Lumbar Spine MRI ordered by primary care outpatient providers within 30 days	565 (6.7%)	657 (5.1%)	−23.9%	<0.001^*
Follow-up PCP visit within 30 days	855 (10.1%)	1224 (9.4%)	−6.9%	0.080
Guideline adherence rate in the use of Lumbar Spine MRI based on manual chart review	78/100 (78%)	96/100 (96%)	+23.1%	0.0002^*

PCP = primary care physician

MRI = magnetic resonance imaging

denotes statistical significance

Due do design of NAMCS survey, tertiary outcome measure was not possible in the control cohort