Bill Walton wrote:

> Please forgive my density ;-)
>
>I understand what Sam's saying, but I don't see how that provides the
>information to which I was referring.  Specifically, how would it be
>recorded that a person was born at something (perhaps significantly) less
>than full-term?
>  
>
well I assume that EDD and DOB are both recorded. So EDD might be 15 sep 
2000 (implying conception on 1/1/2000 - sorry to the obstetricians if I 
am a bit off  here!); DOB might be 1 aug 2000, implying a 6-week 
premature birth. Then an application Age object could compute or provide:
- date_of_birth : Date
- estimated_date_of_delivery: Date
- estimated_date_of_conception : Date
- prematurity: Duration (days/weeks ?)
- biological_age: Duration
- other special concepts.....

I don;t know what specialists call the last two - I am just inventing 
here - but presumably there is a concept representing "age of organism 
since conception".

- thomas beale



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