First CHD event
1 = No CHD
2 = Sudden death
3 = Nonfatal MI
5 = Fatal MI
6 = Other CHD

Day of death
1 = Sunday
2 = Monday
3 = Tuesday
4 = Wednesday
5 = Thursday
6 = Friday
7 = Saturday
9 = Missing

Status at 10 years
0 = Alive
1 = Dead

Family history of CHD
N = No
Y = Yes