Kutcher Adolescent Depression Scale (KADS-11)

Abstract

The Kutcher Adolescent Depression Scale (KADS-11) is a widely utilized, brief, self-report instrument designed specifically for measuring the severity of depression symptoms in adolescence. Developed by Stan Kutcher and colleagues, the 11-item version is a streamlined adaptation intended to efficiently capture key depressive symptomatology, including core mood disturbances, anhedonia, fatigue, and suicidality. KADS-11 is particularly valued for its strong psychometrics, demonstrating high sensitivity to change, which makes it an excellent choice not only for initial screening but also as an outcome measure in clinical trials, such as pediatric pharmacotherapy studies. Its focus on adolescent-specific phrasing enhances its clinical utility in this critical age group.

Keywords

Adolescent depression, KADS-11, Kutcher Adolescent Depression Scale, self-report scale, outcome measure, depressive symptomatology, pediatric psychopharmacology, clinical assessment, screening tool

Authors

Stan Kutcher, Sarah Brooks

Purpose

The primary purpose of the Kutcher Adolescent Depression Scale (KADS-11) is to quantify the severity and monitor the change in depressive symptoms experienced by adolescents. It was specifically developed to be a practical, brief measure suitable for high-volume clinical settings and research environments, particularly those involving longitudinal assessment of treatment efficacy.

Unlike purely diagnostic tools, the KADS-11 functions effectively as an evaluative scale, providing a reliable measure of symptom intensity over a defined period (typically the past week). This allows clinicians and researchers to track response to various interventions, including pharmacological and psychotherapeutic treatments.

Construct

The KADS-11 measures the multifaceted psychological construct of depression as it manifests in adolescents. The items align closely with the diagnostic criteria for Major Depressive Disorder (MDD) outlined in standard classification systems (such as the DSM), but are phrased using language accessible and relevant to younger populations.

The construct encompasses core affective, cognitive, and somatic dimensions of depression, including persistent low mood, anhedonia (loss of pleasure), feelings of worthlessness and hopelessness, concentration difficulties, sleep disturbances, fatigue, anxiety, and suicidal ideation. The inclusion of an explicit item addressing suicidality highlights the clinical severity of the construct being measured.

Validity

Research has consistently supported the validity of the KADS-11, particularly its effectiveness in measuring change over time. Studies, including those conducted during pediatric pharmacotherapy trials, have confirmed its strong concurrent validity when compared against established, longer clinical measures of adolescent depression, such as the Children’s Depression Rating Scale-Revised (CDRS-R).

Furthermore, the scale exhibits excellent discriminative validity, successfully differentiating between adolescents diagnosed with MDD and healthy controls, as well as distinguishing responders from non-responders in clinical treatment trials. Its sensitivity to clinical improvement makes it a robust measure for evaluating the efficacy of therapeutic interventions.

Reliability

The KADS-11 demonstrates high internal consistency, a key indicator of reliability, meaning its items are highly correlated and measure the same underlying construct of depression severity. Published studies typically report strong Cronbach’s alpha coefficients, often exceeding 0.90, indicating excellent reliability across the 11 items.

Test-retest reliability is also generally strong, suggesting that the scale yields stable results over short periods in the absence of clinical change. This stability is crucial for ensuring that observed score variations in intervention studies are attributable to treatment effects rather than measurement error.

Factor Analysis

Factor analytic studies of the KADS-11 often support its use as a largely unidimensional measure, where a single dominant factor—overall depression severity—accounts for the majority of the variance. This outcome justifies the use of a single total score for clinical assessment and research purposes.

However, some analyses suggest the presence of secondary factors, potentially separating somatic/physical symptoms (e.g., fatigue, physical feelings of worry) from core affective symptoms (e.g., sadness, worthlessness). Despite these potential sub-factors, the scale is typically administered and scored based on the total sum, reflecting its primary function as a global index of adolescent depressive burden.

Instrument

Test Type: Self-report symptom severity scale

Format: 11 items, assessed using a modified Likert-type frequency scale, with one specialized item for suicidality.

Language Available: English (Original), potentially other languages (e.g., versions used in Arabic psychological databases).

Population Group: Clinical and non-clinical adolescents.

Age Group: Typically 12 to 18 years.

Population Details: Utilized across various adolescent populations, including those undergoing outpatient psychiatric evaluation and those enrolled in pharmacological trials.

Test Methodology: Respondents rate the frequency or intensity of depressive symptoms experienced “on average” or “usually” over the preceding week.

Keywords

Adolescent mental health, clinical evaluation, pharmacological trial outcome, screening, psychometric instrument, mood disorder, suicidal ideation

Authors

Author ORCID Identifier: Information not provided in the source content.

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

Correspondence Address: Information not provided in the source content.

Permissions & Fee and Test Year

The Kutcher Adolescent Depression Scale (KADS-11) was developed and refined in the early 2000s, with key psychometric validation studies published in 2003 and 2004. Researchers seeking to use the scale should consult the original authors or licensing bodies for the most current information regarding permissions and associated fees. The instrument has been widely distributed in academic literature for research purposes.

Reference’s

• Brooks, Sarah; Kutcher, Stan (2003). “Diagnosis and Measurement of Adolescent Depression: A Review of Commonly Utilized Instruments”. Journal of Child and Adolescent Psychopharmacology 13 (3): 341–376.
• Kutcher, Stan (2003). “The Kutcher Adolescent Depression Scale: Assessment of its Evaluative Properties over the Course of an 8-Week Pediatric Pharmacotherapy Trial”. Child Adolescent Psychopharmacology 13 (3): 337–49.
• Brooks, Sarah; Kutcher, Stan. (2003). The Kutcher Adolescent Depression Scale: Assessment of its Evaluative Properties over the Course of an 8-Week Pediatric Pharmacotherapy Trial. J Child Adolesc Psychopharmacology, 13(3): 337-349.
• Brooks, Sarah (2004). “The Kutcher Adolescent Depression Scale (11-Item)”. Journal of Child and Adolescent Psychopharmacology News 9 (5): 4–6.

The original PDF of the instrument can be downloaded here: http://onlinelibrary.wiley.com/doi/10.1002/9780470750933.app3/pdf

Items of the Kutcher Adolescent Depression Scale (KADS-11)

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

Over the last week, how have you been “on average” or “usually” regarding the following items:

1. Low mood, sadness, feeling blah or down, depressed, just can’t be bothered.
2. Irritable, loosing your temper easily, feeling pissed off, loosing it.
3. Sleep difficulties – different from your usual (over the years before you got sick): trouble falling asleep, lying awake in bed.
4. Feeling decreased interest in: hanging out with friends; being with your best friend; being with your boyfriend/girlfriend; going out of the house; doing school work or work; doing hobbies or sports or recreation.
5. Feelings of worthlessness, hopelessness, letting people down, not being a good person.
6. Feeling tired, feeling fatigued, low in energy, hard to get motivated, have to push to get things done, want to rest or lie down a lot.
7. Trouble concentrating, can’t keep your mind on schoolwork or work, daydreaming when you should be working, hard to focus when reading, getting “bored” with work or school.
8. Feeling that life is not very much fun, not feeling good when usually (before getting sick) would feel good, not getting as much pleasure from fun things as usual (before getting sick).
9. Feeling worried, nervous, panicky, tense, keyed up, anxious.
10. Physical feelings of worry like: headaches, butterflies, nausea, tingling, restlessness, diarrhea, shakes or tremors.
11. Thoughts, plans or actions about suicide or self-harm.

Response Options (Items 1-10): hardly ever, much of the time, most of the time, all the time

Response Options (Item 11): no thoughts or plans or actions, occasional thoughts, no plans or actions, frequent thoughts, no plans or actions, plans and/or actions that have hurt