Respondents were compensated $30 for completion of the W1 survey, $20 for completing the fall surveys (Waves 2, 4, 6), $25 for the spring surveys (Waves 3, 5, 7), and $40 for the remaining Waves 8–10. Respondents received $30 for survey completion if DNA was provided, and $20 for completing Wave 11 without providing a DNA sample. The local university Institutional Review Board approved all study surveys and procedures.
