[Loris-dev] Similar instruments for different cohorts

[Christine Rogers]

Hi Muhammad,

In general, we'd recommend creating one instrument to administer to both
cohort/subproject populations, particularly given that one version is a
proper subset of the other.
As you mention, certain questions can be automatically marked NULL.

There are a few reasons for this best practice, but the key reasons all
boil down to clarity and compatibility of data, whether in the Data
Dictionary or when using the Data Querying Tool for dissemination, or
reproducing an analysis years later.

Christine
On behalf of the LORIS team


On Fri, Aug 25, 2017 at 2:49 PM, Muhammad Khan <mukhan at ualberta.ca> wrote:

> 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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>


-- 

christine.rogers at mcgill.ca
McGill Centre for Integrative Neuroscience | MCIN.ca
Montreal Neurological Institute
McGill University | Montreal | Canada
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