SDQ: Assessing Child and Adolescent Mental Health with the Strengths and Difficulties Questionnaire

Assessing mental health in children and adolescents presents unique challenges. Young people often lack the language to describe their internal experiences. Externalizing behaviors (aggression, hyperactivity) get noticed quickly; internalizing problems (anxiety, sadness, withdrawal) can go undetected for years. And the perspectives of children, parents, and teachers frequently diverge.

The Strengths and Difficulties Questionnaire (SDQ) was designed to navigate these complexities. Brief enough for routine use, broad enough to screen across the major domains of child psychopathology, and structured to capture multiple perspectives, the SDQ has become one of the most widely used child mental health screeners in the world.

Structure

The SDQ contains 25 items divided into five subscales of 5 items each:

Emotional symptoms: Worrying, unhappiness, clinginess, physical complaints from anxiety, fearfulness. This subscale captures internalizing difficulties, the problems most likely to be missed without systematic screening.

Conduct problems: Temper, obedience, fighting, lying, stealing. This subscale identifies behavioral problems that often prompt referral but benefit from structured measurement for severity tracking.

Hyperactivity/inattention: Restlessness, fidgeting, distractibility, impulsivity, task persistence. This subscale screens for ADHD-related difficulties.

Peer relationship problems: Social isolation, being bullied, preference for adult company, difficulty getting along with other children. Peer difficulties are both a risk factor for and consequence of mental health problems.

Prosocial behavior: Helpfulness, consideration of others' feelings, sharing, kindness, volunteering. This is the "strengths" component: measuring positive social behavior rather than just deficits.

Items are scored 0 (not true), 1 (somewhat true), or 2 (certainly true). A Total Difficulties score (0–40) is calculated by summing all subscales except prosocial behavior.

Multi-Informant Design

The SDQ's most valuable feature may be its multi-informant versions:

• Parent/caregiver version: Completed by a parent about their child
• Teacher version: Completed by a teacher about the student
• Self-report version: Completed by the young person themselves (ages 11–17)

Using multiple informant versions for the same child reveals agreement and discrepancy patterns that are clinically informative. Research consistently shows that parents, teachers, and young people only moderately agree about the child's difficulties. This isn't measurement error. It reflects genuine differences in how the child presents across contexts.

When parent and teacher ratings both identify emotional symptoms, the problem is likely pervasive and significant. When only the parent reports problems, the difficulties may be context-specific to the home environment. When the young person self-reports difficulties that parents don't see, the child may be concealing their distress, a clinically important finding.

Interpreting Scores

Total Difficulties score (0–40):

• 0–13: Close to average (80% of population)
• 14–16: Slightly raised
• 17–19: High
• 20–40: Very high

Impact supplement: The SDQ includes an impact supplement asking whether the young person has difficulties with emotions, concentration, behavior, or getting along with others, and if so, how much distress and functional impairment these cause. This supplement is essential. A child scoring in the "slightly raised" range with significant functional impairment may need more clinical attention than a child scoring "high" with minimal impact.

Clinical Applications

Initial screening at referral. The SDQ provides a structured baseline before the first session. Having parent, teacher, and self-report versions completed before the assessment appointment gives you a multi-perspective picture to explore during the clinical interview.

Identifying unexpected areas of difficulty. A child referred for behavior problems may also show elevated emotional symptoms that the family hasn't identified. A child referred for anxiety may have significant peer difficulties that contribute to their distress. The SDQ's broad coverage catches what targeted assessments miss.

Monitoring treatment progress. Administering the SDQ at regular intervals (e.g., every 2–3 months in ongoing therapy) tracks whether improvements in the target domain are accompanied by changes in other areas. A child receiving treatment for conduct problems whose emotional symptoms are rising needs a different clinical conversation.

Supporting formulation. Subscale profiles support case formulation. Is this primarily an emotional presentation? A behavioral one? Is hyperactivity driving peer difficulties? Is emotional distress presenting as conduct problems? The five-subscale structure helps organize clinical thinking.

Working with the Prosocial Subscale

The prosocial subscale is often overlooked or dismissed. This is a mistake. Low prosocial scores (especially below 5) identify children who may struggle with empathy, cooperation, and social reciprocity, difficulties that are risk factors for long-term relational problems and that may respond to specific social skills interventions.

Equally importantly, a child with high total difficulties but strong prosocial scores has protective factors that inform treatment planning and prognosis. Recognizing and building on these strengths is at least as important as addressing difficulties.

Age and Development Considerations

The SDQ is validated for children aged 2–17, with different versions for different age ranges. Key developmental considerations:

Ages 2–4: Only parent/caregiver version available. Items should be interpreted in the context of developmentally normal behaviors (e.g., some oppositional behavior is typical at age 3).

Ages 4–10: Parent and teacher versions. Self-report is generally not reliable below age 11. The discrepancy between home and school reports is particularly informative at this age.

Ages 11–17: Self-report becomes available and valuable. Adolescent self-report is particularly important for internalizing problems that parents and teachers may not observe.

Practical Implementation Tips

Get teacher reports when possible. This requires parental consent and teacher cooperation, but the additional perspective is worth the effort. The teacher version captures behavior in a structured social environment that differs fundamentally from the home.

Administer before the first appointment. Having SDQ data before you meet the child and family means you can ask targeted questions rather than spending the entire first session gathering broad history.

Track change over time visually. Show parents (and age-appropriate young people) the subscale profiles at different time points. Visible change is motivating. Visible stability prompts productive conversations about barriers to progress.

Use the strengths. Start feedback conversations with the prosocial subscale and other areas of strength before discussing difficulties. This builds rapport with both the young person and their parents.