We compared the characteristics of respondent and nonrespondent hospitals and found modest but significant differences.    From Wordnik.com.  [New England Journal of Medicine] Reference

When I was at the magazine, we got low returns on a readership survey and they found, when they looked into it, that a large number of the nonrespondent subscribers couldn’t respond because they’d died.    From Wordnik.com.  [The incredible shrinking magazine « BuzzMachine] Reference