Table 1.

Basic Demographic Characteristics of Patients Undergoing Computed Tomography During the Data Collection Period and Cancellation Rates Following Presentation of Duplicate Decision: Support Alert vs Control

Characteristics	Duplicate Decision Support Alert		Control Alert
Orders, Total No.	11 577		23 048
Clinical orders (nonresearch), Total No.	11 262		22 281
Clinical orders with contrast questionnaire, Total No.	11 074		21 784
Age, mean (range), y	60.0 (14–102)		59.1 (9–103)
Male, %	47.2		45.7
	Completed Order	Cancelled	Completed Order	Cancelled
Orders, No. (%)	10 413 (94.0)	661 (6.0)	21 590 (99.1)	194 (0.9)
Age, mean (range), y	60.0 (14–102)	59.3 (14–92)	59.4 (9–103)	57.5 (9–96)
Male, %	46.7	48.4	45.6	47.4