Defaults are needed to fill in the data the user leaves unspecified
angina on exertion for 1yr and angina at rest
- assume angina at rest for 1day
angina on exertion and angina at rest for 1day
- assume angina on exertion for 2mo
aortic stenosis 5yrs ago and aortic valve replacement 5yrs ago
- assume aortic stenosis was before replacement
digitalis (no time)
- assume drug present at least a week