Serial Number
x1: daily cigarette consumption
x2: systolic blood pressure (mm Hg)
x3: diastolic blood pressure (mm Hg)
x4: mean arterial pressure (mm Hg)
x5: age (years)
x6: height (cm)
x7: weight (kg)
x8: cholesterol (mmol/l)
x9: job grade
x10: job grade
x11: job grade
y: 10-year mortality
t: years of follow-up
d: censoring (0 = censored, 1 = died of CHD)
Job grade