The Inventory of Suicide Orientation-30: Further Validation With Adolescent Psychiatric Inpatients  Augustine Osman University of Northern Iowa  Peter M. Gutierrez Northern Illinois University  Francisco X. Barrios University of Northern Iowa  Courtney L. Bagge University of Missouri-Columbia  Beverly A. Kopper and Sena Linden University of Northern Iowa The present study examined the construct validity of the Inventory of Suicide Orientation-30 (ISO-30; King & Kowalchuk, 1994) with a sample of ado- lescent psychiatric inpatients. The ISO-30 is designed to assess five dimen- sions of risk factors related to suicide: hopelessness, suicide ideation, low self-esteem, inability to cope with emotions, and social isolation and with- drawal. Participants included 202 psychiatric hospitalized (106 boys, 96 girls) adolescents, ages 14 to 17 years. Confirmatory factor analyses pro- vided support for the fit of the original five-factor oblique model. Reliability estimates of the study measures were adequate. Evidence of discriminant, Correspondence concerning this article should be addressed to: Augustine Osman, University of Northern Iowa, Department of Psychology, 334 Baker Hall, Cedar Falls, IA 50614-0505; e-mail: augustine.osman@ uni.edu. Portions of this paper were presented at the Kansas Conference in Clinical Child and Adolescent Psychology, Lawrence, KS (October 2002). JOURNAL OF CLINICAL PSYCHOLOGY, Vol. 61(4), 481–497 (2005) © 2005 Wiley Periodicals, Inc. Published online in Wiley InterScience (www.interscience.wiley.com). DOI: 10.1002/jclp.20086