This digital document is a journal article from Evaluation and Program Planning, published by Elsevier in 2004. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.Description: The treatment response of 139 pregnant and postpartum women in gender-specific residential substance abuse treatment was investigated. These women were assessed with the Addiction Severity Index (ASI) at intake and six months after their discharge. A factor analysis performed with these women's ASI composite scores revealed two distinct factors: a substance use severity factor primarily from the alcohol and drug composite scores, and a general life distress factor primarily from the medical, legal, family/social and psychiatric composite scores. A cluster analysis of the pre- and post-ASI factor scores revealed four main subgroups of women (ranging in size from 14 to 41%) that had different patterns of change in response to treatment. Patterns of change could accurately be predicted for 71% of the women based on intake ASI severity composite scores, history of prior treatment, and service bundle received.