Anticoagulation for Patients with Atrial Fibrillation in Ambulatory Care Settings

Richard Niska; Beth Han

doi:10.3122/jabfm.2009.03.080218

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Table 1.

Percent of Outpatient Visits by Patients with Atrial Fibrillation during which Warfarin was Prescribed or Continued: United States, 2001 to 2006

Characteristics	N (%)	95% CI
All visits	1771 (52.2)	48.3–56.0
Risk factors^*
None	1059 (47.6)	42.4–52.9
Any	712 (58.5)	52.5–64.3
Age (years)
<65	440 (49.8)	42.5–57.1
65–75	508 (49.6)	42.5–56.7
>75	823 (54.4)	49.1–59.6
Sex
Female	873 (47.9)	42.8–53.1
Male	898 (56.4)	50.8–61.9
Race
White	1563 (53.5)	49.4–57.5
Other	208 (40.5)	29.2–53.0
Primary payment source
Private	392 (45.5)	38.5–52.6
Medicare	1094 (53.6)	48.5–58.5
Other	285 (57.1)	45.3–68.2
Region
Northeast	497 (66.2)	59.5–72.3
Midwest	444 (55.2)	48.7–61.5
South	527 (41.1)	33.9–48.7
West	303 (49.9)	40.9–58.8
Metropolitan area
Urban	1527 (52.6)	48.4–56.7
Rural	244 (50.4)	39.8–61.0
Survey year
2001	282 (40.0)	30.4–50.3
2002	279 (51.8)	42.1–61.5
2003	272 (55.2)	43.5–66.3
2004	267 (50.7)	40.2–61.0
2005	270 (57.7)	46.6–68.1
2006	401 (56.6)	49.0–63.9
Primary care physician
Yes	671 (52.5)	46.5–58.4
No	1100 (51.7)	46.7–56.8
Visits during last 12 months
0 (including new patients)	208 (39.1)	27.0–52.7
1–2	421 (49.5)	42.7–56.2
≥3	1142 (54.6)	49.6–59.5
Aspirin
Prescribed	281 (45.9)	36.4–55.6
Not prescribed	1490 (53.4)	49.2–57.5

* Risk factors: stroke, diabetes, hypertension, congestive heart failure, rheumatic mitral valve disease, arterial embolism.
N, unweighted sample size.

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Table 2.

Adjusted Odds Ratios for Prescribing or Continuing Warfarin during Visits by Patients with Atrial Fibrillation (N = 1771): United States, 2001 to 2006

Characteristics	OR (95% CI)
Risk factors^*
None	1.00
Any	1.40 (1.00–1.94)
Age (years)
<65	1.08 (0.66–1.78)
65–75	0.90 (0.62–1.31)
>75	1.00
Sex
Female	0.69 (0.50–0.94)
Male	1.00
Race
White	1.00
Other	0.49 (0.29–0.83)
Primary payment source
Private	1.00
Medicare	1.56 (1.01–2.39)
Other	1.82 (0.99–3.36)
Region
Northeast	1.00
Midwest	0.60 (0.39–0.93)
South	0.35 (0.22–0.55)
West	0.53 (0.33–0.87)
Metropolitan area
Urban	1.00
Rural	1.02 (0.61–1.70)
Survey year
2001	1.00
2002	1.60 (0.92–2.78)
2003	1.73 (0.93–3.19)
2004	1.42 (0.77–2.62)
2005	1.99 (1.10–3.61)
2006	2.02 (1.16–3.51)
Primary care physician
Yes	0.99 (0.68–1.43)
No	1.00
Visits during last 12 months
0 (including new patients)	1.00
1–2	1.45 (0.68–3.09)
≥3	1.85 (0.96–3.56)
Aspirin
Prescribed	0.62 (0.41–0.95)
Not prescribed	1.00

* Risk factors: stroke, diabetes, hypertension, congestive heart failure, rheumatic mitral valve disease, arterial embolism.
N, unweighted sample size; OR, odds ratio. Bolded values were statistically significant (confidence intervals did not include 1.00).