Western Collaborative Group Study

Description

3154 healthy young men aged 39-59 from the San Francisco area were assessed for their personality type. All were free from coronary heart disease at the start of the research. Eight and a half years later change in this situation was recorded.

Format

A data frame with 3154 observations on the following 13 variables.

age

age in years

height

height in inches

weight

weight in pounds

sdp

systolic blood pressure in mm Hg

dbp

diastolic blood pressure in mm Hg

chol

Fasting serum cholesterol in mm %

behave

behavior type which is a factor with levels A1 A2 B3 B4

cigs

number of cigarettes smoked per day

dibep

behavior type a factor with levels A (Agressive) B (Passive)

chd

coronary heat disease developed is a factor with levels no yes

typechd

type of coronary heart disease is a factor with levels angina infdeath none silent

timechd

Time of CHD event or end of follow-up

arcus

arcus senilis is a factor with levels absent present

Details

The WCGS began in 1960 with 3,524 male volunteers who were employed by 11 California companies. Subjects were 39 to 59 years old and free of heart disease as determined by electrocardiogram. After the initial screening, the study population dropped to 3,154 and the number of companies to 10 because of various exclusions. The cohort comprised both blue- and white-collar employees. At baseline the following information was collected: socio-demographic including age, education, marital status, income, occupation; physical and physiological including height, weight, blood pressure, electrocardiogram, and corneal arcus; biochemical including cholesterol and lipoprotein fractions; medical and family history and use of medications; behavioral data including Type A interview, smoking, exercise, and alcohol use. Later surveys added data on anthropometry, triglycerides, Jenkins Activity Survey, and caffeine use. Average follow-up continued for 8.5 years with repeat examinations

Source

Statistics for Epidemiology by N. Jewell (2004)

References

Coronary Heart Disease in the Western Collaborative Group Study Final Follow-up Experience of 8 1/2 Years Ray H. Rosenman, MD; Richard J. Brand, PhD; C. David Jenkins, PhD; Meyer Friedman, MD; Reuben Straus, MD; Moses Wurm, MD JAMA. 1975;233(8):872-877. doi:10.1001/jama.1975.03260080034016.

Examples

data(wcgs)
## maybe str(wcgs) ; plot(wcgs) ...