OBJECTIVE: To assess whether length of questionnaire affects response rates. METHODS: A quasi-randomised trial of women aged 70 years and over in a general practice in England. Three questionnaires of different lengths: a clinical questionnaire (four pages); the same questionnaire plus the EuroQol (five pages); the same questionnaire plus the SF-12 (seven pages). The impact of length on the proportion of returned questionnaires and item completion rates was assessed. RESULTS: In total, 847 questionnaires were mailed; response rates were 49%, 49% and 40% to the short, medium and long questionnaires, respectively. This difference was statistically significant when the short questionnaire was compared against the longest instrument (9% difference; 95% confidence interval (CI) of difference = 0.3% to 16.6%). Item completion rates for the clinical questionnaire did not differ. Respondents did not differ in age or self-reported health status between the three groups. CONCLUSIONS: Increasing the length of a questionnaire from five to seven pages reduces response rates from women aged 70 years and over. However, lengthening a questionnaire does not seem to affect the quality of responses to questions near the front of the questionnaire.
RCT Entities:
OBJECTIVE: To assess whether length of questionnaire affects response rates. METHODS: A quasi-randomised trial of women aged 70 years and over in a general practice in England. Three questionnaires of different lengths: a clinical questionnaire (four pages); the same questionnaire plus the EuroQol (five pages); the same questionnaire plus the SF-12 (seven pages). The impact of length on the proportion of returned questionnaires and item completion rates was assessed. RESULTS: In total, 847 questionnaires were mailed; response rates were 49%, 49% and 40% to the short, medium and long questionnaires, respectively. This difference was statistically significant when the short questionnaire was compared against the longest instrument (9% difference; 95% confidence interval (CI) of difference = 0.3% to 16.6%). Item completion rates for the clinical questionnaire did not differ. Respondents did not differ in age or self-reported health status between the three groups. CONCLUSIONS: Increasing the length of a questionnaire from five to seven pages reduces response rates from women aged 70 years and over. However, lengthening a questionnaire does not seem to affect the quality of responses to questions near the front of the questionnaire.
Authors: Cynthia P Iglesias; Yvonne Birks; Elizabeth A Nelson; Elizabeth Scanlon; Nicky A Cullum Journal: Qual Life Res Date: 2005-09 Impact factor: 4.147
Authors: Rachel A Nakash; Jane L Hutton; Ellen C Jørstad-Stein; Simon Gates; Sarah E Lamb Journal: BMC Med Res Methodol Date: 2006-02-23 Impact factor: 4.615
Authors: Philip James Edwards; Ian Roberts; Mike J Clarke; Carolyn Diguiseppi; Reinhard Wentz; Irene Kwan; Rachel Cooper; Lambert M Felix; Sarah Pratap Journal: Cochrane Database Syst Rev Date: 2009-07-08
Authors: Katie Gillies; Anna Kearney; Ciara Keenan; Shaun Treweek; Jemma Hudson; Valerie C Brueton; Thomas Conway; Andrew Hunter; Louise Murphy; Peter J Carr; Greta Rait; Paul Manson; Magaly Aceves-Martins Journal: Cochrane Database Syst Rev Date: 2021-03-06