Table 3 Health care surveys that compared identifiable and non-identifiable surveys
Author, year | Population | Survey topic | Intervention | Control |
|---|---|---|---|---|
King, 1970 | College students | Drug use | Coded questionnaire | Non-coded questionnaire |
King, 1970 | College students | Drug use and attitudes | ||
Campbell, 1990 | General population | AIDS knowledge | Numbering with warning of reminders | Non-numbered questionnaire |
Akl, 2011 | Residency program directors (Family medicine) | Characteristics of residency program | Questionnaire numbered “to avoid sending reminders” | Non-numbered questionnaire |
Akl, 2011 | Residency program directors (Internal medicine) | |||
Kundig, 2011 | Hospital staff | Patient safety culture | Numbered questionnaire | Non-numbered questionnaire |
This study | Hospital doctors and nurses | Regret associated with health care | Numbered envelope | Non-numbered envelope |