Table 1. Patient Characteristics, Stratified by the Use of Aspirin.

Demographics	No aspirin use, n (%)	Aspirin use, n (%)	P value
Age category
18 - 44	6,025 (2.93)	115 (0.61)	< 0.001*
45 - 64	95,745 (46.5)	5,770 (30.63)
> 65	104,130 (50.57)	12,950 (68.75)
Sex
Male	153,110 (74.4)	14,735 (78.23)	< 0.001*
Female	52,790 (25.64)	4,100 (21.8)
Race
White	112,575 (54.67)	11,540 (61.27)	< 0.001*
Black	31,325 (15.21)	3,480 (18.48)
Hispanic	36,885 (17.91)	2,265 (12.03)
Asian/Pacific Islander	14,875 (7.22)	935 (4.96)
Native American	2,040 (0.99)	150 (0.80)
Other	8,200 (3.98)	465 (2.47)
Primary expected payer
Medicare	108,920 (52.9)	12,715 (67.51)	< 0.001*
Medicaid	40,480 (19.66)	2,270 (12.05)
Private	42,205 (20.5)	3,055 (16.22)
Uninsured	6,425 (3.12)	230 (1.22)
Median household income
Lowest quartile	66,725 (32.41)	6,155 (32.68)	0.74
Second quartile	52,195 (25.35)	4,675 (24.82)
Third quartile	47,065 (22.86)	4,235 (22.48)
Highest quartile	39,915 (19.39)	3,770 (20.02)
Hospital region
Northeast	41,300 (20.06)	3,625 (19.25)	< 0.001*
Midwest	35,695 (17.34)	4,480 (23.79)
South	77,620 (37.7)	6,890 (36.58)
West	51,285 (24.91)	3,840 (20.39)
Hospital location
Rural	7,135 (3.47)	645 (3.43)	0.91
Urban	198,765 (96.53)	18,190 (96.58)
Hospital teaching status
Non-teaching hospitals	36,055 (17.51)	2,995 (15.9)	0.02*
Teaching hospitals	169,845 (82.49)	15,840 (84.1)
Hospital bed size
Small	29,565 (14.36)	2,820 (14.97)	0.62
Medium	50,220 (24.39)	4,620 (24.53)
Large	126,115 (61.25)	11,395 (60.5)
Elixhauser comorbidities
0	1,745 (.85)	90 (0.48)	< 0.001*
1	6,985 (3.39)	345 (1.83)
2	16,975 (8.24)	945 (5.01)
> 3	180,195 (87.52)	17,455 (92.67)

*P < 0.05.