[Loris-dev] Similar instruments for different cohorts

[Muhammad Khan]

Hi guys!

In our project, patients and control, for the most part, are administered
the same set of instruments. However, the patients are usually asked a few
additional questions for a particular instrument, and so the 'control
version' of the instrument is just a subset of the 'patient version' of the
instrument.

In terms of creating the instrument on the Behavioral database, I have
thought of two ways to go about implementing this:

i. Create two versions of the same instrument ( one called "Instrument Name
(Control), the other "Instrument Name (Patient)), and assign the
appropriate Sub_group in the test_names table.

ii. Create one instrument, and only display the 'patient fields' if the
subject belongs to the patient Sub_group. This wouldn't be difficult, but
there would be a lot of NULL entries for the control Sub_group. When
querying the data using the Data Query Tool, this may cause some issues.

My question is, which would be the better way of doing it, creating one
instrument for both Sub_group, or have two separate instruments, one for
each Sub_group?

Thanks,
Muhammad
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