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The "Dropout Question" system variable is an open-text variable. If the interview is not completed, this variable will contain the name of the first question on the last page that the respondent viewed.
For example, if a survey includes questions q1, q2, q3, q4 and q5, and a respondent answers q1 and q2 but closes the browser after getting to but before answering q3, the dropout question will be q3. Note however that if a respondent answers q1, q2 and q3, and then when he/she reaches q4 uses the survey Back button to get back to q2, and then closes the browser or navigates away without changing anything, the dropout question will be q2.
This variable can be used in tables in the same way as any other open text variables. An additional option for this variable is "Display mode", which allows you to choose whether variable names are to be displayed "as is", or whether question titles are to be used instead for better readability. This variable can be used in Segment Expression designer and in Filter Expression designer in the same way as any other open text variables.