Outcome Questionnaire (OQ-45.2)

Abstract

The Outcome Questionnaire (OQ-45.2) is a widely utilized, self-report psychotherapy outcome measure designed for Routine Outcome Monitoring (ROM). Developed by Lambert and colleagues, this instrument consists of 45 items intended to assess the subjective experience of distress and overall functioning in clients receiving mental health treatment. It is structured to provide a global score of psychological health, along with three specific subscale scores covering symptomatic distress, interpersonal relations, and social-role functioning. The OQ-45.2 is designed to be administered repeatedly throughout the course of treatment to track client progress and identify potential treatment failures early on.

Keywords

Outcome Questionnaire, OQ-45.2, Routine Outcome Monitoring, ROM, Symptom Distress, Social-Role Functioning, Interpersonal Relationships, Clinical Outcome.

Authors

Michael J. Lambert, Nancy B. Hansen, Vicki Umpress, Kirk Lunnen, John Okiishi, and Gary M. Burlingame.

Purpose

The primary purpose of the Outcome Questionnaire (OQ-45.2) is to provide clinicians and researchers with a brief, reliable, and valid measure for assessing client progress and treatment outcomes in clinical practice settings. It facilitates Routine Outcome Monitoring (ROM), allowing therapists to track changes in client well-being over time, from intake through termination.

By quantifying the degree of psychological distress and functional impairment experienced by the client, the OQ-45.2 serves as an essential feedback tool. It is particularly valuable for identifying clients who are deteriorating or failing to respond to treatment, enabling timely clinical adjustments and improved quality assurance within mental health services.

Construct

The OQ-45.2 measures the overall construct of psychological health and functional impairment, which is empirically broken down into three primary subscales, reflecting distinct domains of client functioning:

• Symptom Distress (SD): This subscale captures internal symptoms related to anxiety, depression, somatization, and general psychological discomfort. These items address the client’s subjective experience of Symptom Distress.
• Social-Role functioning (SR): This subscale assesses difficulties in fulfilling primary social roles, such as those related to work, school, or managing daily responsibilities, including leisure activities and substance use issues.
• Interpersonal Relationships (IR): This subscale measures the quality and satisfaction derived from intimate relationships, family interactions, and general social connections, including feelings of loneliness or conflict.

Validity

The OQ-45.2 is recognized for its strong psychometric properties, demonstrating substantial validity across various clinical and non-clinical populations. Studies have consistently supported its concurrent and predictive validity, showing that scores correlate appropriately with other established measures of psychological distress and predict clinical status.

The instrument’s ability to detect clinically significant change (reliable change index) is a critical component of its validity, confirming its utility in distinguishing between clients who genuinely improve and those who remain unchanged or worsen. Furthermore, research, such as that by Beretvas and Kearney (2003), has validated the scores across different ethnic groups, reinforcing its generalizability and applicability in diverse clinical settings.

Reliability

The reliability of the OQ-45.2 is consistently high. Internal consistency, typically measured using Cronbach’s alpha, generally exceeds 0.90 for the total score, indicating that the 45 items reliably measure a unified construct of distress and functioning. The individual subscales (SD, SR, IR) also exhibit satisfactory internal consistency, generally ranging from 0.70 to 0.85.

Test-retest reliability is also well-established, confirming the stability of the measure over short periods when no clinical intervention has occurred. This robust reliability ensures that observed changes in scores during treatment are attributable to genuine clinical change rather than measurement error.

Factor Analysis

Factor analysis of the OQ-45.2 consistently supports a robust three-factor structure corresponding to the three conceptual subscales: Symptom Distress (SD), Social-Role functioning (SR), and Interpersonal Relationships (IR). The analysis confirms that the 45 items load appropriately onto these three distinct, yet correlated, factors.

The original factor structure, developed by Lambert et al. (1996), has been maintained in subsequent revisions (like the OQ-45.2) and validated across diverse samples, confirming that the instrument effectively measures these three specific dimensions of psychological functioning. The total score, representing the general distress factor, is derived from the summation of scores across all three subscales.

Instrument

Test Type: Self-report questionnaire designed for outcome monitoring in psychotherapy.

Format: 45 items administered via a 5-point Likert scale.

Language Available: English (original), with numerous translations available (e.g., Spanish, German, Dutch, Norwegian).

Population Group: Clinical and non-clinical populations seeking mental health services.

Age Group: Adults (variants exist for adolescents, such as the OQ-45.2 YOA).

Population Details: The scale is appropriate for use with individuals experiencing a wide range of psychological and emotional problems, including issues related to substance use (three specific items address alcohol/drug use).

Test Methodology: Respondents rate the frequency of their experiences over the past week using a 5-point Likert scale ranging from “0=never” to “4= almost always”. Nine items (1, 12, 13, 20, 21, 24, 31, 37, and 43) are reverse-coded. For the three Alcohol Use items, respondents are prompted to select “never” if the item is not applicable due to not drinking or using drugs.

Keywords

Psychological assessment, clinical monitoring, treatment outcome, OQ-45.2, mental health scale, distress measurement.

Authors

Author ORCID Identifier: Not publicly available for all authors; typically proprietary information.

Affiliation Email addresses: Information not provided in the source material.

Correspondence Address: Correspondence is generally handled through the official licensing body for the OQ-45.2.

Permissions & Fee and Test Year

The OQ-45.2 was developed and published in 1996 (Lambert et al.). The instrument is proprietary and typically requires licensing or purchase for clinical use, often managed by the specific organization founded by the principal authors.

The instrument can be found in PDF format through external resources. The original PDF can be downloaded here: http://www.therapyworx.net/uploads/OQ-45.2_Adult.pdf. An additional report on the OQ-45 can be found here: http://cmhc.utexas.edu/pdf/OQ45report.pdf.

Reference’s

Lambert, M. J. (1983). Introduction to assessment of psychotherapy outcome: Historical perspective and current issues. In M. J. Lambert, E. R. Christensen, & S. S. DeJulio (Eds.), The assessment of psychotherapy outcome (pp. 132-147). New York: Wiley.

Lambert, M. J., Hansen, N. B., Umpress, V., Lunnen, K., Okiishi, J., & Burlingame, G. M. (1996). Administration and scoring manual for the OQ-45.2. Stevenson, MD: American Professional Credentialing Services.

Beretvas. S. Natasha and Kearney. Lisa K., 2003. A Shortened Form of the Outcome Questionnaire: A Validation of Scores Across Ethnic Groups. The Counseling & Mental Health Center The University of Texas at Austin.

Items of the Outcome Questionnaire (OQ-45.2)

IMPORTANT: The following scale items must be preserved in their original language and must not be changed in any way.

1. I get along well with others
2. I tire quickly
3. I feel no interest in things
4. I feel stressed at work/school
5. I blame myself for things
6. I feel irritated.
7. I feel unhappy in my marriage/significant relationship.
8. I have thoughts of ending my life.
9. I feel weak.
10. I feel fearful.
11. After heavy drinking, I need a drink the next morning to get going. (If you do not drink mark “never”).
12. I find my work/school satisfying.
13. I am a happy person.
14. I work/study too much.
15. I feel worthless.
16. I am concerned about family troubles.
17. I have an unfulfilling sex life.
18. I feel lonely.
19. I have frequent arguments.
20. I feel loved and wanted.
21. I enjoy my spare time.
22. I have difficulty concentrating.
23. I feel hopeless about the future.
24. I like myself.
25. Disturbing thoughts come into my mind that I can’t get rid of.
26. I feel annoyed by people who criticize my drinking (or drug use). (If not applicable mark “never”).
27. I have an upset stomach.
28. I am working/studying less well than I used to.
29. My heart pounds too much.
30. I have trouble getting along with friends and close acquaintances.
31. I am satisfied with my life.
32. I have trouble at work/school because of drinking or drug use. (If not applicable mark “never”).
33. I feel that something bad is going to happen.
34. I have sore muscles.
35. I feel afraid of open spaces, or of driving, or being on buses, subways, etc.
36. I feel nervous.
37. I feel my love relationships are full and complete.
38. I feel that I am not doing well at work/school.
39. I have too many disagreements at work/school.
40. I feel something is wrong with my mind.
41. I have trouble falling asleep or staying asleep.
42. I feel blue.
43. I am satisfied with my relationships with others.
44. I feel angry enough at work/school to do something I might regret.
45. I have headaches.