Table 1.

Characteristics of the four included trials investigating the impact coronary artery calcium scanning on cardiovascular risk factors and downstream testing

Author, year	Imaging Modality	Primary Outcome	Number of Participants	Age, mean (yrs)	Male (%)	Follow-up (yrs)	Imaging Abnormality (%)*
Lederman et al, 200736	DHCT1	CVD Risk Factors	56	65	0	1	n/a
O’Malley et al, 200334	EBT2	10yr FRS5 event rate	450	42	79	1	15
Obuchowski et al, 200735	Total Body CT / MDCT3	Incident Clinical Disease	50	55	50	2	64
Rozanski et al, 201133	EBT2/MCT4	CAD Risk Factors	1,934	59	53	4	52

¹– Double Helical Computed Tomography

²– Electron Beam Tomography

³– Multidetector Computed Tomograph

⁴– Multislice Computed Tomography

⁵– Framingham Risk Score

^*Defined as any abnormality.