Trends in Ambulatory Prescribing of Antiplatelet Therapy among US Ischemic Stroke Patients: 2000–2007
Table 2
Association between patient demographic and physician office/hospital characteristics and antiplatelet agent prescribed: NAMCS, NHAMCS 2000–2007a , b.
Antiplatelet medication
Characteristic
Aspirin only
Clopidogrel only
Aspirin and clopidogrel
Aspirin and dipyridamole
()
()
()
()
Population estimate
%
value
Population estimate
%
value
Population estimate
%
value
Population estimate
%
value
Total
1,194,958
—
818,437
—
978,810
—
366,967
—
Race
White
958,151
80.2%
0.40
581,489
71.0%
0.68
708,008
72.3%
0.91
341,339
93.0%
0.11
Black
201,745
16.9%
150,228
18.4%
203,509
20.8%
22,867
6.2%
Other
35,062
2.9%
86,720
10.6%
67,293
6.9%
2761
0.8%
Region
Northeast
304,874
25.5%
0.38
82,604
10.1%
0.52
111,832
11.4%
0.47
62,510
17.0%
0.75
Midwest
217,812
18.2%
287,327
35.1%
161,843
16.5%
108,731
29.6%
South
433,594
36.3%
259,449
31.7%
466,195
47.6%
84,482
23.0%
West
238,678
20.0%
189,057
23.1%
238,940
24.4%
111,244
30.3%
Age
18–44 years
65,453
5.5%
0.39
10,958
1.3%
0.03
17,561
1.8%
0.20
12364
3.4%
0.90
45–64 years
436,552
36.5%
116,735
14.3%
404,818
41.4%
95,313
26.0%
≥65 years
692,953
58.0%
690,744
84.4%
556,431
56.8%
259,290
70.7%
Gender
Female
632,517
52.9%
0.71
522,671
63.9%
0.15
192,540
19.7%
<0.01
113,778
31.0%
0.22
Male
562,441
47.1%
295,766
36.1%
786,270
80.3%
253,189
69.0%
Insurancec
Private insurance
355,686
29.8%
0.31
187,508
22.9%
0.47
405,119
41.4%
0.21
64,802
17.7%
0.73
Medicare
656,260
54.9%
572,429
69.9%
461,148
47.1%
267,898
73.0%
Medicaid
71,523
6.0%
26,884
3.3%
53,025
5.4%
10,678
2.9%
Other
55,345
4.6%
21,151
2.6%
14,927
1.5%
10,620
2.9%
Location
MSAd
994,903
83.3%
0.82
646,403
79.0%
0.58
852,053
87.0%
0.72
224,322
61.1%
0.30
Non-MSA
200,055
16.7%
172,034
21.0%
126,757
13.0%
142,645
38.9%
Setting
Physician office
711,071
59.5%
0.05
726,058
88.7%
<0.01
870,856
89.0%
0.01
317,518
86.5%
0.21
Hospital OPDe
56,218
4.7%
49,195
6.0%
5,305
0.5%
8,951
2.4%
Hospital ED
427,669
35.8%
43,184
5.3%
102,649
10.5%
40,498
11.0%
Year
2000-01
360,067
30.1%
0.13
107,873
13.2%
0.22
23,542
2.4%
<0.01
118,183
32.2%
0.62
2002-03
244,855
20.5%
151,764
18.5%
192,779
19.7%
47,861
13.0%
2004-05
213,034
17.8%
327,148
40.0%
456,787
46.7%
104,817
28.6%
2006-07
377,002
31.5%
231,652
28.3%
305,702
31.2%
96,106
26.2%
aNAMCS: National Ambulatory Medical Care Survey, NHAMCS: National Hospital Ambulatory Medical Care Survey.
bPopulation estimates were calculated using SAS-callable SUDAAN software, version 9.0.1 (Research Triangle Institute) to obtain proper variance estimations that accounted for the complex sampling design of the National Ambulatory Medical Care Survey and National Hospital Ambulatory Medical Care Survey and results that were weighted to reflect national population estimates.
cInsurance (payment source) does not sum to 100% because of missing data, dMSA: Metropolitan Statistical Area.
eOPD: Outpatient Department.
