Metaresearch on patient-reported outcomes in trial protocols and results publications suggested large outcome reporting bias, 2025, Heravi, Busse et

There are things that could be done to improve PRO inclusions, such as reporting what % of participants fully filled out the questionnaire. A low number might indicate selection bias (or fatalities, or "too sick to fill out a form"). Whichever improvements are in the guidelines, the problem lies in motivating people to follow them properly, and in dealing with the people who find ways to abuse them. Guidelines may work for ethical people, but they're not the problem the guidelines are meant to solve.
 
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