The PSC-17 is a 17-item parent-report screen for psychosocial problems in children and adolescents, typically aged 4 to 17. A parent or carer rates how often each behaviour describes their child - never, sometimes or often - and the result indicates whether the child's overall emotional and behavioural functioning warrants further assessment.
Alongside the total score it yields three subscale scores: internalising problems (five items covering sadness, worry and withdrawal), attention problems (five items covering concentration, restlessness and distractibility) and externalising problems (seven items covering conduct, defiance and aggression). The subscales point assessment in the right direction; none of them is a diagnostic instrument on its own.
02 - Origin & purpose
Where it comes from.
The parent instrument is the 35-item Pediatric Symptom Checklist, developed by Michael Jellinek and J. Michael Murphy at Massachusetts General Hospital in the 1980s to give paediatricians a quick way of spotting psychosocial dysfunction during routine visits. It became one of the most widely used whole-child screens in primary care.
In 1999 William Gardner and colleagues derived the 17-item short form from data on 18,045 children collected through two large primary-care research networks (PROS and ASPN), keeping the items that best defined three clinically useful factors. The stated purpose was pragmatic: a screen short enough for a waiting room that still separates internalising, attention and externalising problems. Murphy and colleagues confirmed the three-factor structure and the subscale reliabilities in a new national sample of 80,680 paediatric outpatients in 2016.
03 - Scoring & cutoffs
How scoring works.
Each item is scored never = 0, sometimes = 1, often = 2, giving a total from 0 to 34. A total of 15 or more is a positive screen for significant psychosocial impairment. The subscales are scored from their own items and have separate cutoffs: 5 or more on internalising (range 0-10), 7 or more on attention (range 0-10), and 7 or more on externalising (range 0-14). A child can screen positive on a subscale without crossing the total cutoff, and that pattern is worth attention - a focused problem can be clinically significant before it drags the total score over 15. Any positive screen should be followed by a proper clinical assessment, not treated as a diagnosis.
Score
Severity
Interpretation
0–14
Not significant
Below the threshold for clinically significant psychosocial impairment.
15–34
Significant
Total of 15 or more suggests significant psychosocial difficulty; further evaluation recommended.
04 - Validation evidence
How well it performs.
The PSC-17 carries unusually strong normative evidence for a brief screen: its derivation sample alone contained over 18,000 children, and the 2016 replication confirmed the factor structure and reliabilities in more than 80,000 paediatric outpatients across the United States. A 2025 national Australian study has since added normative data and predictive validity outside the US. What the evidence base lacks is a single agreed sensitivity/specificity figure against structured diagnostic interview - the instrument's support rests on factor structure, internal consistency and large-sample norms rather than on one criterion study.
α = 0.89
Internal consistency (total)
α = 0.87
Replication (total)
α = 0.78-0.83
Subscale reliability
3 factors confirmed
Factor structure
05 - How it compares
How it compares to the alternatives.
Instrument
Items
Time
When to reach for it
PSC-35
35 items
~5 min
The full-length parent checklist; use when you want the original instrument and time allows.
Y-PSC
35 items
~5 min
The youth self-report version for ages 11+; use when the young person's own account matters more than the parent's.
Suicide-specific screen for young people; the PSC-17 contains no suicide item, so pair them where risk screening is required.
06 - When to use it
Right tool, wrong tool.
Reach for it when
-Routine whole-child psychosocial screening at intake or annual review, ages 4-17
-Waiting-room or pre-visit completion by a parent in under five minutes
-Separating internalising, attention and conduct problems at first contact
-Services that need a free, reproducible screen across a whole caseload
Reach for something else when
-Diagnosing any specific disorder - the PSC-17 identifies need for assessment, nothing more
-Children under about 4 - the preschool evidence base is thin
-Hearing the young person's own account - use the Y-PSC self-report from age 11
-Grading severity of anxiety or low mood once identified - use the RCADS
-Suicide risk - the PSC-17 contains no suicide item; use the ASQ
07 - Confidence & precision
Reading the score with care.
No formal standard error of measurement or minimally important change has been established for the PSC-17. Reliable-change estimates in the order of six points on the total score and two points on a subscale have been proposed from the published reliabilities, but they are derived figures, not validated thresholds. In practice the score is best read categorically - positive or negative against the cutoffs - with small movements around the threshold treated as noise. When tracking a child over time, look for consistent direction across repeated administrations rather than reacting to single-point changes.
08 - Limitations
What it cannot tell you.
It reports the parent's perception, and parents can under- or over-report; discrepancy with the child's own account is common and informative.
Cutoffs were derived in US primary-care samples; local prevalence and culture shift how many children screen positive.
A positive attention subscale is not an ADHD diagnosis, and a positive screen of any kind is not a referral criterion by itself.
Evidence in preschool children is much thinner than in school-age children.
The instrument contains no suicide or self-harm item, so it cannot stand alone where risk screening is required.
Translations exist but have varying levels of validation.
Common questions from clinicians
FAQ
References
Source literature.
[1]Gardner W, Murphy M, Childs G, et al. The PSC-17: a brief pediatric symptom checklist with psychosocial problem subscales. A report from PROS and ASPN (1999) ↩
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