I recently completed a survey in which the demographic questions were asked at the end instead of the beginning. I assume that this is because there are no specific screening questions for the purpose of the study, or that there was a particular reason for doing this.
It seems like the convention is to ask these types of questions at the beginning rather than the end of the survey, but I wonder if the benefit of having people commit to answering questions and then putting the more personal questions at the end results in a higher response rate or not.
In this specific case there was an incentive involved for the participant (i.e. a prize draw if the survey is completed) so I don't know if this affects the way the survey question order has been designed.
Is there a significant difference in where the screening or demographic questions are placed in a survey? Are there studies on the resulting response rate to support the practice of putting them at the beginning?