Page 90 - Let them speak Towards a patient reported outcome measure set for

Chapter 4
Figure 2. PRISMA Flowchart of the identification and selection process of condition-specific COS
studies.
COS, core outcome set.
In total, 36 PROs were extracted from the five condition-specific COSs. PROs
with the same meaning were grouped together (e.g., ‘communication’ and
‘speech’) and assigned identical terms, resulting in 22 different PROs. After
eliminating seven PROs that did not qualify as PROs as they did not represent
health aspects reported by patients (e.g., ‘medication management’),
15 PROs remained. These were further subdivided into unidimensional
PROs (e.g., ‘digestive and respiratory problems’ were subdivided into two
unique unidimensional PROs; ‘gastrointestinal symptoms’ and ‘respiratory
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