Table 1. Demographic data and overall advanced radiology examination utilization rate.

Characteristics	Number (%)	CT utilization	MRI utilization
Total (n, %)	737760 (100)	156287 (21.2)	35018 (4.8)
Gender (n, %)
Male	386415 (52.4)	88256 (22.8)	18481 (4.8)
Female	351345 (47.6)	68031 (19.4)	16537 (4.7)
Patient age (years)
<20	201698 (27.3)	17567 (87.1)*	1032 (5.4)*
20–40	161125 (21.8)	32696 (202.9)*	2947 (18.3)*
40–60	194857 (26.4)	53109 (272.6)*	11472 (58.9)*
>60	180053 (24.4)	52913 (293.9)*	19566 (108.7)*
Missing or unknown	27 (0.0)

*Calculated per 1000 ED visits.

CT = computed tomography; MRI = magnetic resonance imaging.