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. Author manuscript; available in PMC: 2021 Jun 21.

Published in final edited form as: Atherosclerosis. 2021 Mar 26;326:56–62. doi: 10.1016/j.atherosclerosis.2021.03.018

Table 2.

Absolute Event Rates and Estimated 10-Year Number Needed to Treat for ASCVD and CHD According to CAC Status

Outcome		Persistent CAC=0 (N=244)	Incident CAC (N=317)
All ASCVD	N (%)	16 (6.6)	41 (12.9)
	Event rate (95% CI)^A	4.3 (2.2, 6.4)	8.6 (6.0, 11.2)
	10-year NNT	117	54
Coronary Heart Disease	N (%)	4 (1.6)	24 (2.5)
	Event rate (95% CI)^A	1.1 (0.0, 2.1)	5.0 (3.0, 6.9)
	10-year NNT	398	106

^A.

Events per 1,000 person-years

NNT calculations assume a 30% relative risk reduction of events on statin therapy.

ASCVD=atherosclerotic cardiovascular disease. CAC=coronary artery calcification. NNT=number needed to treat