PURPOSE: To determine whether follow-up phone calls improve response rates to a long questionnaire among black and white subjects. METHODS:Forty black and 39 white Seventh-day Adventist churches were randomized to experimental or control status in a 2:1 ratio favoring the intervention, which is a follow-up phone call to certain church members. Subjects selected from each church were those who had signed up for the Adventist Health Study-2 but not returned a questionnaire 3 months after promotion began. Further returns from a church over the next 3 months, and this increment as a proportion of baseline response, were assessed using t-tests and Poisson regression, respectively. RESULTS: Comparing black experimental and control churches, the mean difference was 5.5 returned questionnaires per church (p < 0.01). Among white churches the mean difference was 3.0 (ns). The baseline-adjusted increment, however, was greater by a factor of 3.37 (95% confidence interval, 1.92, 5.93) in the black experimental relative to control churches, but among white experimental churches was 13% (ns) lower than controls. This difference in response by ethnic group was statistically significant (p < 0.01). CONCLUSION: Follow-up phone calls improved response rates among black subjects only.
RCT Entities:
PURPOSE: To determine whether follow-up phone calls improve response rates to a long questionnaire among black and white subjects. METHODS: Forty black and 39 white Seventh-day Adventist churches were randomized to experimental or control status in a 2:1 ratio favoring the intervention, which is a follow-up phone call to certain church members. Subjects selected from each church were those who had signed up for the Adventist Health Study-2 but not returned a questionnaire 3 months after promotion began. Further returns from a church over the next 3 months, and this increment as a proportion of baseline response, were assessed using t-tests and Poisson regression, respectively. RESULTS: Comparing black experimental and control churches, the mean difference was 5.5 returned questionnaires per church (p < 0.01). Among white churches the mean difference was 3.0 (ns). The baseline-adjusted increment, however, was greater by a factor of 3.37 (95% confidence interval, 1.92, 5.93) in the black experimental relative to control churches, but among white experimental churches was 13% (ns) lower than controls. This difference in response by ethnic group was statistically significant (p < 0.01). CONCLUSION: Follow-up phone calls improved response rates among black subjects only.
Authors: Lisa M Nicholson; Patricia M Schwirian; Elizabeth G Klein; Theresa Skybo; Lisa Murray-Johnson; Ihuoma Eneli; Bethany Boettner; Gina M French; Judith A Groner Journal: Contemp Clin Trials Date: 2011-01-27 Impact factor: 2.226
Authors: Antronette K Yancey; R Patti Herring; Gary E Fraser; Ru Yan; Phyllip Baker; Andrew Lampkin; James Kyle Journal: Prev Med Date: 2007-12-23 Impact factor: 4.018
Authors: Jeanette M Daly; Yinghui Xu; Emily Yanca; Steven M Levy; Barcey T Levy; Jennifer Talbert; Jennifer L Tran; Martha Ann Keels; Margherita Fontana Journal: J Prim Care Community Health Date: 2022 Jan-Dec
Authors: Patti Herring; Terry Butler; Sonja Hall; Hannelore Bennett; Susanne B Montgomery; Gary Fraser Journal: BMC Med Res Methodol Date: 2014-04-03 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: M Nabil El-Khorazaty; Allan A Johnson; Michele Kiely; Ayman A E El-Mohandes; Siva Subramanian; Haziel A Laryea; Kennan B Murray; Jutta S Thornberry; Jill G Joseph Journal: BMC Public Health Date: 2007-09-06 Impact factor: 3.295