Summary of differences in volumes of MR neuroimaging examinations interpreted by radiologists versus nonradiologists in a 5% national Medicare sample

	Day of Week^{^a}		Site of Service^{^a}				Patient Complexity^{^a} (Mean CCI)
	Weekday	Weekend	ED	Inpatient	Outpatient	Office	Patient Complexity^{^a} (Mean CCI)
Radiologists	475,288	52,028	21,393	124,511	227,055	152,487	0.58
Nonradiologists	39,510	1597	303	1579	2180	36,890	0.40