Table 2.

Incidence rates for atrial fibrillation/flutter within the SLE and general Medicaid cohorts from 2007 to 2010 by baseline covariates.

Variables	SLE				General Medicaid
Variables	N	Events	PY	IR^* (95% CI)	N	Events	PY	IR^* (95% CI)
All patients	46,876	121	89,494	1.4 (1.1–1.6)	187,504	241	333,216	0.7 (0.6–0.8)
18–39 yrs	21,139	27	39,789	0.7 (0.5–1.0)	84,461	^‡	^‡	0.1 (< 0.1–0.1)
40–49 yrs	12,552	29	24,153	1.2 (0.8–1.7)	50,340	42	91,389	0.5 (0.3–0.6)
50–65 yrs	13,185	65	25,552	2.5 (2.0–3.2)	52,703	191	98,665	1.9 (1.7–2.2)
Sex
Female	43,482	106	83,296	1.3 (1.1–1.5)	173,928	210	309,555	0.7 (0.6–0.8)
Male	3394	15	6198	2.4 (1.5–4.0)	13,576	31	23,661	1.3 (0.9–1.9)
Hypertension
No	29,558	44	56,138	0.8 (0.6–1.1)	159,156	136	280,572	0.5 (0.4–0.6)
Yes	17,318	77	33,356	2.3 (1.9–2.9)	28,348	105	52,644	2.0 (1.6–2.4)
Valvular disease
No	43,838	102	83,720	1.2 (1.0–1.5)	184,878	219	328,700	0.7 (0.6–0.8)
Yes	3038	19	5773	3.3 (2.1–5.2)	2626	22	4516	4.9 (3.2–7.4)
LN/CKD
No	37,789	74	69,972	1.1 (0.8–1.3)	328,135	230	5081	0.7 (0.6–0.8)
Yes	9087	47	19,521	2.4 (1.8–3.2)	5081	11	328,418	2.2 (1.2–3.9)
CVD^†
No	39,352	69	75,415	0.9 (0.7–1.2)	177,048	163	314,620	0.5 (0.5–0.6)
Yes	7524	52	14,079	3.7 (2.8–4.8)	10,456	78	18,596	4.2 (3.4–5.2)
Glucocorticoid use
No	27,664	65	51,812	1.3 (1.0–1.6)	176,722	223	315,156	0.7 (0.6–0.8)
Yes	19,212	56	37,682	1.5 (1.2–1.9)	10,782	18	18,060	1.0 (0.6–1.6)

↵* IR: per 1000 PY.
↵† CVD: baseline presence of any CVD by ICD-9 codes for angina, MI, old MI, percutaneous coronary intervention, atherosclerosis, cerebrovascular accident, coronary artery bypass graft, peripheral vascular disease, carotid stenosis, heart failure.
↵‡ Cell sizes under 11 are suppressed according to Federal Reporting Requirements. SLE: systemic lupus erythematosus; PY: person-years; IR: incidence rate; CVD: cardiovascular disease; CKD: chronic kidney disease; ICD-9: International Classification of Diseases, 9th revision; MI: myocardial infarction; LN: lupus nephritis.