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Updated: Jul 26, 2026

Detection of Architectural Distortion in Prior Mammograms via Analysis of Oriented Patterns
Published on: August 30, 2013
The impact of survey nonresponse bias on conclusions drawn from a mammography intervention trial
Melissa R Partin1, Michael Malone, Mary Winnett
1Center for Chronic Disease Outcomes Research, Minneapolis VA Medical Center (152/2E), 1 Veterans Drive, Minneapolis, MN 55417, USA. melissa.partin@med.va.gov
Background And Objective:
This study demonstrates the impact of survey nonresponse bias on conclusions from a mammography trial targeting a disadvantaged population.
Methods:
The trial randomized 1558 women to three interventions designed to promote repeat mammography: mailed reminder (minimum group); mailed thank-you card, patient newsletters, and reminder (maximum group); and no mailings (control group). The primary outcome, repeat mammogram within 15 months, was assessed from administrative and phone survey data.
Results:
Administrative estimates revealed a statistically significant difference of 7% between the maximum and control groups on the primary outcome. Survey estimates (response rate 80%) revealed no significant differences. The differences by data source were traced to a survey nonresponse bias. There was a statistically significant difference of 16% between the maximum and control groups among survey nonrespondents for the primary outcome, but there were no differences among survey respondents.
Conclusion:
The findings reiterate that even a low survey nonresponse rate can bias study conclusions and suggest studies targeting disadvantaged populations should avoid relying solely on survey data for outcome analyses.
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