Letters

Designing a questionnaire: Send a personal covering letter

BMJ 1994; 308 doi: https://doi.org/10.1136/bmj.308.6922.202c (Published 15 January 1994) Cite this as: BMJ 1994;308:202
  1. A F Bissett
  1. Department of Public Health Medicine, Grampian Health Board, Aberdeen AB9 1RE.

    EDITOR, - In writing about designing a questionnaire D H Stone only briefly mentions a covering letter for postal questionnaires.1 The importance of such letters has been debated: one experiment found no significant difference in response rate between a …

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