. Author manuscript; available in PMC: 2013 Sep 1.

Published in final edited form as: JACC Cardiovasc Imaging. 2012 Sep;5(9):923–930. doi: 10.1016/j.jcmg.2012.01.022

Table 2.

CAC Prevalence, Amount, and NNS Compared With FRS Categories (N = 2,832)

	FRS Categories
CAC Score Group	0%–2.5% (n = 2,372)	2.6%–5% (n = 287)	5.1%–10% (n = 115)	>10% (n = 58)	p Value
Median CAC score (IQR)^*	17.9 (5.1–64.5)	16.6 (5.6–52.2)	18.9 (11.9–73.5)	58.8 (20.6–215.7)

CAC score >0, % (n = 279)	7.3	20.2	19.1	44.8	<0.01
NNS	13.7	5.0	5.2	2.2

CAC score ≥100, % (n = 51)	1.3	2.4	3.5	17.2	<0.01
NNS	79	41	28.8	5.8

Among those with a CAC score >0.

IQR = interquartile range, NNS = number needed to screen (number of people who need to be screened to identify 1 person with a CAC score above a pre-specified cut point in each Framingham risk score category); other abbreviations as in Table 1.