Received Dec. 16, 1996; revisions received Nov. 10, 1997; and Feb. 17, 1998; accepted April 24, 1998. From the Better Homes Fund, the Department of Psychiatry, Harvard Medical School; and the Department of Epidemiology, Harvard School of Public Health. Address reprint requests to Dr. Bassuk, The Better Homes Fund, 181 Wells Ave., Newton Centre, MA 02159. Supported by NIMH grants MH-47312 and MH-51479 and Maternal and Child Health Bureau grant MCJ250809. The National Comorbidity Survey was funded by grants from NIMH (MH/DA-46376 and MH-49098), the National Institute on Drug Addiction (supplement to MH/DA-46376), and the W.T. Grant Foundation (90135190). (Information on the availability of National Comorbidity Survey data to outside researchers for secondary analyses can be found on the Internet [http://www.hcp.med.harvard.edu/ncs/].)The authors acknowledge the contributions of the following persons in the conduct of this research: Carolyn Banach, M.A., Jocelyne Bauduy, M.A., Margaret Brooks, B.A., Angela Browne, Ph.D., Linda Cohan, M.S.W., Mardia Coleman, Ann Dalianis, M.A., Veronica Guerrero-Macia, M.A., Barbra Page, M.A., Nancy Popp, Ed.D., Laurie Ross, M.A., Amy Salomon, Ph.D., Julia Vera, Linda Weinreb, M.D., Constance Wood, M.S.W., and Dorothy St. Cyr, B.A.