The AHAA study was funded by a grant from the National Institute of Child Health and Human Development under grants 01 HD40428-02 to the Population Research Center, University of Texas at Austin; Chandra Muller (PI) and from the National Science Foundation under grant REC-0126167 to the Population Research Center, University of Texas at Austin; Chandra Muller and Pedro Reyes (Co-PI).

Additionally, this study uses data from Add Health, a program project designed by J. Richard Udry, Peter S. Bearman, and Kathleen Mullan Harris, and funded by a grant P01-HD31921 from the National Institute of Child Health and Human Development, with cooperative funding from 17 other agencies. Special acknowledgment is due Ronald R. Rindfuss and Barbara Entwisle for assistance in the original design.

Opinions reflect those of the authors and do not necessarily reflect those of the granting agencies. Persons interested in obtaining data files from Add Health or AHAA should contact Add Health, Carolina Population Center, 123 W. Franklin Street, Chapel Hill, NC 27516-2524.

If you use the AHAA data, please include the above language in the acknowledgements section of any study for publication or presentation.