• Score on the Center for Epidemiologic Studies Depression Scale [ Time Frame: Measured immediately post-treatment and at Months 6, 12, and 18 follow-ups ] [ Designated as safety issue: No ]
  
• Rating on Children's Global Assessment Scale [ Time Frame: Measured immediately post-treatment and at Months 6, 12, and 18 follow-ups ] [ Designated as safety issue: No ]
  
• Depression diagnoses on the Kiddie Schedule for Affective Disorders and Schizophrenia (K-SADS) diagnostic instrument [ Time Frame: Measured immediately post-treatment and at Months 6, 12, and 18 follow-ups ] [ Designated as safety issue: No ]
  

• Score on the Conflict Behavior Questionnaire [ Time Frame: Measured immediately post-treatment and at Months 6, 12, and 18 follow-ups ] [ Designated as safety issue: No ]
  
• Score on the Social Adjustment Scale [ Time Frame: Measured immediately post-treatment and at Months 6, 12, and 18 follow-ups ] [ Designated as safety issue: No ]
  
• Score on the Perceived Social Support scale [ Time Frame: Measured immediately post-treatment and at Months 6, 12, and 18 follow-ups ] [ Designated as safety issue: No ]
  

Depression is a serious medical illness that is difficult to diagnose and treat, especially in children and adolescents. Signs of depression in children may include the following behaviors: pretending to be sick; refusing to go to school; clinging to a parent; or worrying that a parent may die. Older children may sulk, behave inappropriately at school, act in a negative or grouchy manner, or feel misunderstood. Because normal behaviors vary from one childhood stage to another, it can be difficult to determine whether a child is going through a temporary "phase" or is suffering from depression. This study will compare IPT-AST, Enhanced IPT-AST, and Usual Care for the prevention of adolescent depression.

Participation in this single-blind study will last approximately 21 months. Participants will be randomly assigned to receive either IPT-AST, Enhanced IPT-AST, or Usual Care for 12 weeks. IPT-AST is a school-based group intervention program that focuses on prevention, psychoeducation, and interpersonal skill-building. Enhanced IPT-AST will entail IPT-AST plus three parent-adolescent sessions. Usual Care will consist of standard treatments and will not include IPT-AST. Study visits will occur before and during the intervention at baseline and Weeks 6 and 12. Follow-up visits will occur 6, 12, and 18 months post-intervention. Study visit assessments will include depression symptoms, anxiety symptoms, psychiatric diagnoses, overall functioning, social adjustment, parent-child conflict, perceived support from parents and peers, and service utilization.

Inclusion Criteria:

• Between grades 7 and 10 in school
• Score of at least 16 on the Center for Epidemiologic Studies Short Depression Scale (CES-D)
• Currently experiencing at least 2 symptoms on the K-SADS depression section, one of which is either depressed mood, irritability, or an inability to feel pleasure during normal activities
• Score of at least 61 on the Children's Global Assessment Scale (CGAS), indicating mild to moderate impairment
• English-speaking

Exclusion Criteria:

• Score of 15 or less on the CES-D scale
• Currently experiencing fewer than 2 depression symptoms on the K-SADS or 2 or more symptoms on the K-SADS with no report of depressed mood, irritability, or anhedonia
• Attempted suicide or self-mutilation in the year prior to study entry
• Current active suicidal ideation and/or history of a clinically significant suicidal behavior (i.e., with intent to die and high medical lethality) or repeated patterns of self-injurious behavior
• Current major depressive disorder or dysthymia as determined by K-SADS
• Current DSM-IV diagnosis of psychosis, substance abuse or dependence, bipolar disorder, obsessive compulsive disorder, post-traumatic stress disorder, panic disorder, or conduct disorder as determined by K-SADS
• Score of 60 or less on the CGAS, indicating substantial functional impairment