Table 2: Association between patient demographic and physician office/hospital characteristics and antiplatelet agent prescribed: NAMCS, NHAMCS 2000–2007a , b.

Antiplatelet medication
CharacteristicAspirin only Clopidogrel only Aspirin and clopidogrelAspirin and dipyridamole
( )( ) ( )( )

Population estimate% valuePopulation estimate% valuePopulation estimate% valuePopulation estimate% value

Total1,194,958818,437978,810366,967

Race
 White958,15180.2%0.40

581,48971.0%0.68

708,00872.3%0.91

341,33993.0%0.11

 Black201,74516.9%150,22818.4%203,50920.8%22,8676.2%
 Other35,0622.9%86,72010.6%67,2936.9%27610.8%

Region
 Northeast304,87425.5%0.38


82,60410.1%0.52


111,83211.4%0.47


62,51017.0%0.75


 Midwest 217,81218.2%287,32735.1%161,84316.5%108,73129.6%
 South433,59436.3%259,44931.7%466,19547.6%84,48223.0%
 West238,67820.0%189,05723.1%238,94024.4%111,24430.3%

Age
 18–44 years65,4535.5%0.39

10,9581.3%0.03 17,5611.8%0.20

123643.4%0.90

 45–64 years436,55236.5%116,73514.3%404,81841.4%95,31326.0%
 ≥65 years692,95358.0%690,74484.4%556,43156.8%259,29070.7%

Gender
 Female632,51752.9%0.71
522,67163.9%0.15
192,54019.7%<0.01113,77831.0%0.22
 Male562,44147.1%295,76636.1%786,27080.3%253,18969.0%

Insurancec
 Private insurance355,68629.8%0.31


187,50822.9%0.47


405,11941.4%0.21


64,80217.7%0.73


 Medicare656,26054.9%572,42969.9%461,14847.1%267,89873.0%
 Medicaid71,5236.0%26,8843.3%53,0255.4%10,6782.9%
 Other55,3454.6%21,1512.6%14,9271.5%10,6202.9%

Location
 MSAd994,90383.3%0.82
646,40379.0%0.58
852,05387.0%0.72
224,32261.1%0.30
 Non-MSA200,05516.7%172,03421.0%126,75713.0%142,64538.9%

Setting
 Physician office711,07159.5%0.05
726,05888.7%<0.01
870,85689.0%0.01
317,51886.5%0.21

 Hospital OPDe56,2184.7%49,1956.0%5,3050.5%8,9512.4%
 Hospital ED427,66935.8%43,1845.3%102,64910.5%40,49811.0%

Year
 2000-01360,06730.1%0.13


107,87313.2%0.22


23,5422.4%<0.01

118,18332.2%0.62


 2002-03244,85520.5%151,76418.5%192,77919.7%47,86113.0%
 2004-05213,03417.8%327,14840.0%456,78746.7%104,81728.6%
 2006-07377,00231.5%231,65228.3%305,70231.2%96,10626.2%

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.