Table 2.

Demographic and basic characteristics of study sample.

Variables	Weighted n	Weighted % (SE)
Age (yr)
18–44	1647036	32.51 (0.54)
45–64	1966026	38.81 (0.23)
>/=65 yr	1453278	28.69 (0.60)
Race
White	3000973	59.23 (1.12)
African American	1311140	25.88 (0.77)
Hispanic	470020	9.28 (0.83)
Other∗	284208	5.61 (0.34)
Gender
Male	2580702	50.94 (0.32)
Female	2485683	49.06 (0.32)
Co-morbid medical conditions
Cerebrovascular disease	250198	4.94 (0.13)
Chronic pulmonary disease	1234119	24.36 (0.32)
Congestive heart failure	478081	9.44 (0.21)
Connective tissue disease	59259	1.17 (0.03)
Dementia	240368	4.74 (0.1687)
Diabetes with complications	110006	2.17 (0.05)
Diabetes without complications	1099976	21.71 (0.21)
Metastatic carcinoma	81172	1.60 (0.05)
Mild liver disease	159860	3.16 (0.07)
Moderate to severe liver disease	33872	0.67 (0.03)
Paraplegia/hemiplegia	62018	1.22 (0.03)
Peptic ulcer disease	58228	1.15 (0.06)
Peripheral vascular disease	149670	2.95 (0.08)
Renal disease	328530	6.48 (0.16)
Primary payer
Medicare	2808950	55.44 (0.59)
Medicaid	1354011	26.73 (0.60)
Private	498989	9.85 (0.29)
Other†	404390	7.98 (0.35)
Total in-hospital charge
<$10,000	1481012	29.23 (0.69)
$10,000–$49,999	2895462	57.15 (0.46)
>$50,000	689866	13.62 (0.45)
Mortality
Alive	4991029	98.65 (0.04)
Dead	68440	1.35 (0.04)	Mean (CI)
Length of stay (d) - LOS			9.08 (8.71 – 9.45)
Charlson's co-morbidity index - CCI			1.20 (1.17 – 1.24)