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. Author manuscript; available in PMC: 2015 Aug 1.
Published in final edited form as: Arthritis Care Res (Hoboken). 2014 Aug;66(8):1177–1185. doi: 10.1002/acr.22271

Table 2.

Progression Categories for Coronary Artery Calcium (CAC) and Aorta Calcium (AC) in Women with SLE (cases) and Controls from the Study of Lupus Vascular and Bone Long-term Endpoints (2002-present), Chicago, IL

Low without Progression (N(%)) Low with Progression (N(%)) High to Low (N(%)) High without Progression (N(%)) High with Progression (N(%)) Relative Risk (95% CI)
CAC Cases (N=149) 106 (71.1) 14 (9.4) 2 (1.3) 14 (9.4) 13 (8.7) 1.77 (1.03–3.05)
Controls (N=124) 101 (81.5) 10 (8.1) 3 (2.4) 4 (3.2) 6 (4.8)
AC Cases (N=113) 71 (62.8) 15 (13.3) 4 (3.5) 6 (5.3) 17 (15.0) 1.57 (0.97–2.53)
Controls (N=122) 88 (72.1) 10 (8.2) 2 (1.6) 10 (8.2) 12 (9.8)

Low CAC defined as < 10 Agatston units, low AC defined as < 100 Agatston units. High CAC defined as ≥ 10 Agatston units, high AC defined as ≥ 100 Agatston units.

Progression definition:

If CAC = 0 Agatston units at baseline, progression was defined as CAC > 0 Agatston units at follow-up. If 0 < CAC < 100 Agatston units at baseline, progression was defined as an annualized change of ≥ 10 Agatston units at follow-up. If CAC ≥ 100 Agatston units at baseline, progression was defined as an annualized percent change ≥ 10% at follow-up. If AC = 0 Agatston units at baseline, progression was defined as AC > 0 Agatston units at follow-up. If 0 < AC < 1000 Agatston units at baseline, progression was defined as an annualized change of ≥ 100 Agatston units at follow-up. If AC ≥ 100 Agatston units at baseline, progression was defined as an annualized percent change ≥ 10% at follow-up.

Relative Risks were calculated as the ratio of the proportion of all cases who progressed and the proportion of all controls who progressed.