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"completed questionnaires" is correct and usable in written English.
For example, you might say: "We received 500 completed questionnaires from the survey participants."
Exact(59)
They completed questionnaires annually from 2005-2009.
HCPs and patients completed questionnaires anonymously.
All completed questionnaires were included for analysis.
The final sample included 537 completed questionnaires.
Completed questionnaires were first checked and coded.
The nurses providing patient care completed questionnaires.
Seventy one patients returned completed questionnaires.
A total of 406 completed questionnaires were received.
A senior doctor assisted in vetting the completed questionnaires.
Of the 530 EDs, 324 (61.1%) returned completed questionnaires.
The response rate was 78.5% (2356 completed questionnaires).
Related(20)
eliminated questionnaires
completed sheets
completed interviews
compiled questionnaires
completed papers
finished questionnaires
collected questionnaires
compliance questionnaires
implementation questionnaires
completed survey
full questionnaires
completed interview
uncompleted questionnaires
completed listings
completed laterals
completed episodes
completed homes
completed sets
completed internships
completion questionnaires
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com