Re: More on: Re: [Gnumed-devel] First sample of gui function docs

[Karsten Hilbert]

> ii) capturing
> systematic nulls is hardly any extra work, and may be clinically
> important: it is the difference between recording "unknown because
> question not asked" and "unknown because patient does not know answer"
> and "nil/none".
OK. So:

- not asked
  - no data available
  - NIL/NULL
- asked but no data obtained
  - not known to patient
  - patient cannot answer (unconscious, ...)
  - patient withholds information
- asked and negated
  - condition *known to not apply* to patient

Any other *important* (not *possible*) null value I forgot ?

> It is simple to implement: reserve
> one type of null (I suggest the database back-end NULL value) to mean
> "not asked", and assign specific values or codes for the other two types
> of nulls.
Any good suggestions for implementation at the database/Python
level ?

Occurs to me that currently we have no way of recording "has
no allergies". Only "no allergy data recorded". This will change RSN.

> It does
> presuppose that there are reserved codes or values for every field that
> indicate  "answer not known by patient" and "nil/none" - but that can be
> done by creating a super class for input fields which provide this as
> default behaviour.
What is your suggestion re the details of implementation ?

Karsten
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