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Table 4 Percentage of respondents answering "don't know"

From: A randomized trial of mailed questionnaires versus telephone interviews: Response patterns in a survey

Item Don't-knows (%)
  Telephone Mail
I seem to get sick a little easier than other people 3.33 10.22
I am as healthy as anybody I know 2.69 13.90
I expect my health to get worse 4.36 23.76
My health is excellent 2.05 10.39