Received Nov. 3, 2003; revisions received June 3 and July 29, 2004; accepted Oct. 1, 2004. From the American Indian and Alaska Native Programs, University of Colorado at Denver and Health Sciences Center, Aurora. Address correspondence and reprint requests to Dr. Beals, American Indian and Alaska Native Programs, University of Colorado at Denver and Health Sciences Center, MS F800, PO Box 6508, Aurora, CO 80045-0508; firstname.lastname@example.org (e-mail). The study was supported by NIH grants R01 MH-48174 (Dr. Manson and Dr. Beals, principal investigators), P01 MH-42473 (Dr. Manson, principal investigators), R01 DA-14817 (Dr. Beals, principal investigator), and R01 AA-13420 (Dr. Beals, principal investigator). National Comorbidity Survey (NCS) data were made available by the International Consortium of Political and Social Research; NCS was supported by the following grants with R. Kessler as principal investigator: NIH grants R01 MH/DA-46376 and R01 MH-49098 and grant 90135190 from the William T. Grant Foundation. In addition to the authors named at the beginning of the article, the American Indian Service Utilization, Psychiatric Epidemiology, Risk and Protective Factors Project (AI-SUPERPFP) team includes Cecelia K. Big Crow, Dedra Buchwald, Buck Chambers, Michelle L. Christensen, Denise A. Dillard, Karen DuBray, Paula A. Espinoza, Candace M. Fleming, Ann Wilson Frederick, Diana Gurley, Lori L. Jervis, Shirlene M. Jim, Carol E. Kaufman, Ellen M. Keane, Suzell A. Klein, Denise Lee, Monica C. McNulty, Denise L. Middlebrook, Laurie A. Moore, Tilda D. Nez, Ilena M. Norton, Heather D. Orton, Carlette J. Randall, Angela Sam, James H. Shore, Sylvia G. Simpson, Paul Spicer, and Lorette L. Yazzie. The authors thank interviewers and computer/data management and administrative staff members Anna E. Barón, Amelia T. Begay, Cathy A.E. Bell, Mary Cook, Helen J. Curley, Mary C. Davenport, Rhonda Wiegman Dick, Marvine D. Douville, Geneva Emhoolah, Fay Flame, Roslyn Green, Billie K. Greene, Jack Herman, Tamara Holmes, Shelly Hubing, Cameron R. Joe, Louise F. Joe, Cheryl L. Martin, Jeff Miller, Robert H. Moran Jr., Natalie K. Murphy, Ralph L. Roanhorse, Margo Schwab, Jennifer Settlemire, Donna M. Shangreaux, Matilda J. Shorty, Selena S. S. Simmons, Jennifer Truel, Lori Trullinger, Jennifer M. Warren, Theresa (Dawn) Wright, Jenny J. Yazzie, and Sheila A. Young; Methods Advisory Group members Margarita Alegria, Evelyn J. Bromet, Dedra Buchwald, Peter Guarnaccia, Steven G. Heeringa,Ronald Kessler, R. Jay Turner, and William A. Vega; and the tribal members who so generously answered all the questions asked of them.