Testing prepaid incentives and a mail questionnaire to increase response in a multi-wave telephone survey
The National Longitudinal Transition Study 2 (NLTS2), funded by the U.S. Department of Education, is a nationwide longitudinal study designed to collect information on the education, activities, and development of youth with disabilities. NLTS2 follows approximately 11,000 youth with disabilities and their parents over a 10-year period as the youth transition from high school into their young adult lives; interviews began in 2001 and are conducted by telephone every two years with both parents and youth. In 2007, we conducted an experiment to test the effectiveness of using a prepaid token incentive (rather than a post-survey incentive) and a mail questionnaire (as an alternative to the telephone interview). The results showed that parents who were provided the option of completing a mail survey were significantly more likely to respond than those who were provided only a letter reminding them of the telephone interview (with or without a prepaid incentive).