BMC Medical Research Methodology

Table 1 Characteristics of the sample. Descriptive statistic – mean (SD) or% of all the predictor variables involved

From: Comparison of risks of cardiovascular events in the elderly using standard survival analysis and multiple-events and recurrent-events methods

	No.	%	Mean (SD)
Gender
Male	2466	42.6
Female	3329	57.4
Race
White	4855	83.8
African American	901	15.6
Others	39	0.67
Education
Less than high school	1701	29.5
High school or above	4071	70.5
Age group			71-72*
BMI status
Overweight**	1192	20.6
Obese	1762	30.4
Hypertension drug
Use drug	2749	47.5
Not use drug	3040	52.5
Smoking status
Former smoker	2398	41.4
Current smoker	698	12.1
Systolic BP	5784		136.6 (21.9)
Total cholesterol	5739		211.1 (39.3)
HDL	5730		54.2 (15.7)
Diabetes
Yes	946	16.5
No	4786	83.5
Family history of CVD
Yes	1698	32.0
No	4492	76.3
Lipid lowering drug
Yes	311	5.4
No	5478	94.6
Prior CVD
Yes	1303	22.1
No	4492	76.3

*Age is categorized into 13 2-year age groups, starting at age 65 (i.e., ages 65,66 forms the first group), and the last group includes 89 years old and above.
**Overweight is defined as BMI > 27 in males and 25 in females; Obese is defined as BMI > 29.6 in males or 27.3 in females.

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ISSN: 1471-2288

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