I am working on a set analysis expression and have been struggling with the last piece.
I appreciate all help.
=aggr
(
only
(
{$
<PatientName=P({$<ScanType={'XR'}>}PatientName)>
*
<PatientName=P({$<ScanType={'CT'}>}PatientName)>
}
PatientName
),
PatientName
)
Existing expression correctly identifies all patients who had both 'XR' and 'CT'. I need to further modify it, so that it only looks for patients who had a XR, within 40 days prior to the CT.
I have a field, ScanStart, that tells me when the scan took place.
nothing?