Australian Norms for Self-Report Mental Health Tools: A Practitioner Reference

Why Australian norms matter

Self-report measures are calibrated against the populations they were originally validated in. A score of 10 on the GAD-7 means roughly the same thing in Sydney as it does in Pittsburgh — but the *prevalence* of that score, and the *percentile* it places a person in, is a property of the reference population. When you tell a client that their score sits "in the moderate range" or that "most people in the community score below this", that statement is only as accurate as the norms behind it.

For a long time, Australian practitioners used international reference data — typically derived from US primary-care or US student samples — for a wide range of tools. Over the past two decades, several large Australian community studies have produced national reference data that is now the appropriate default for Australian clinical practice.

This page is a working reference for which tools have those Australian norms and where to cite them.

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Tools with strong Australian reference data

K10 — Kessler Psychological Distress Scale

Australian reference data: Yes — gold standard.

The K10 is the most thoroughly normed psychological distress measure in Australia. The 2007 National Survey of Mental Health and Wellbeing (NSMHWB) provided population norms for n = 8,841 representative Australian adults, and the K10 is included in every wave of the Australian Bureau of Statistics National Health Survey. Australian severity bands published by the ABS (10–15 low, 16–21 moderate, 22–29 high, 30–50 very high) differ from typical international cut-points and are the canonical bands for Australian clinical and reporting use.

Citations:

• Slade T, Grove R, Burgess P. Kessler Psychological Distress Scale: normative data from the 2007 Australian National Survey of Mental Health and Wellbeing. *Aust N Z J Psychiatry*. 2011;45(4):308-316. doi:10.3109/00048674.2010.543653.
• Andrews G, Slade T. Interpreting scores on the Kessler Psychological Distress Scale (K10). *Aust N Z J Public Health*. 2001;25(6):494-497.
• Australian Bureau of Statistics. *Information Paper: Use of the Kessler Psychological Distress Scale in ABS Health Surveys, Australia, 2007–08* (cat. no. 4817.0.55.001). CC BY 4.0.

K5 / MK-K5 — Indigenous-adapted Kessler

Australian reference data: Yes — Aboriginal and Torres Strait Islander specific.

The K5 is used in the National Aboriginal and Torres Strait Islander Health Survey. A culturally modified version (MK-K5) has been validated in a national sample of 6,988 Aboriginal and Torres Strait Islander adults aged 16+, with a recommended cut-off of 11 for ever-diagnosed depression or anxiety. This is the appropriate scale where the K10 is not culturally suitable.

Citation:

• Brinckley MM, Calabria B, Walker J, Thurber KA, Lovett R. Reliability, validity, and clinical utility of a culturally modified Kessler scale (MK-K5) in the Aboriginal and Torres Strait Islander population. *BMC Public Health*. 2021;21:1111. doi:10.1186/s12889-021-11138-4.

PHQ-9 — Patient Health Questionnaire

Australian reference data: Yes — community + Indigenous adaptation.

A national online survey of 13,829 Australian adults during the COVID-19 period provides the largest available Australian community reference dataset for the PHQ-9 (and GAD-7). For Aboriginal Australians, an adapted PHQ-9 was developed and validated in central Australian Aboriginal men, retaining the cut-point of ≥10 for probable depression.

Citations:

• Stocker R, Tran T, Hammarberg K, Nguyen H, Rowe H, Fisher J. Patient Health Questionnaire 9 (PHQ-9) and General Anxiety Disorder 7 (GAD-7) data contributed by 13,829 respondents to a national survey about COVID-19 restrictions in Australia. *Psychiatry Res*. 2021;298:113792. doi:10.1016/j.psychres.2021.113792.
• Brown ADH, Mentha R, Rowley KG, Skinner T, Davy C, O'Dea K. Depression in Aboriginal men in central Australia: adaptation of the Patient Health Questionnaire 9. *BMC Psychiatry*. 2013;13:271. doi:10.1186/1471-244X-13-271.

GAD-7 — Generalised Anxiety Disorder Scale

Australian reference data: Yes — same Stocker 2021 cohort.

The Stocker et al. (2021) dataset (n = 13,829) supports the standard 5/10/15 severity cut-points in an Australian general adult population. No dedicated Australian normative paper has been published for the GAD-7 outside this cohort.

Citation:

• Stocker et al. (2021), as above.

DASS-21 / DASS-42 — Depression Anxiety Stress Scales

Australian reference data: Yes — Australian-origin scale, Australian general adult percentiles available.

The DASS family is an Australian-origin instrument developed at UNSW (Lovibond & Lovibond, 1995). Australian general adult percentile norms with interval estimates are reported by Crawford and colleagues (2011) for both the full DASS-42 and the short DASS-21, alongside several other self-report mood scales.

Citations:

• Lovibond SH, Lovibond PF. *Depression Anxiety Stress Scales*. 2nd ed. Sydney: Psychology Foundation of Australia; 1995.
• Crawford JR, Cayley C, Lovibond PF, Wilson PH, Hartley C. Percentile norms and accompanying interval estimates from an Australian general adult population sample for self-report mood scales. *Aust Psychol*. 2011;46(1):3-14. doi:10.1111/j.1742-9544.2010.00003.x.

DASS-Y — DASS Youth

Australian reference data: Yes — Australian-origin youth norms (n = 2,121).

The DASS-Y was developed and validated in an Australian youth sample of 2,121 children and adolescents aged 7–18 by Szabó & Lovibond at UNSW. This is the appropriate version for paediatric use and the only DASS variant with native Australian youth normative data.

Citation:

• Szabó M, Lovibond PF. Development and Psychometric Properties of the DASS-Youth (DASS-Y): An Extension of the Depression Anxiety Stress Scales (DASS) to Adolescents and Children. *Front Psychol*. 2022;13:766890. doi:10.3389/fpsyg.2022.766890.

CES-D — Center for Epidemiologic Studies Depression Scale

Australian reference data: Yes for CES-D; partial for CES-D-R.

The Crawford et al. (2011) Australian general-adult percentile paper includes the original CES-D alongside the DASS family. No dedicated Australian normative paper has been published for the revised CES-D-R (Eaton 2004); international cut-points (≥16 for clinically significant symptoms) are typically applied.

Citation:

• Crawford et al. (2011), as above.

IPIP-NEO-20 / IPIP-NEO-120 — Big Five personality

Australian reference data: Yes — large open-data subset.

The IPIP family is in the public domain. John A. Johnson maintains an open IPIP-NEO public-domain dataset, with an Australian respondent subset of approximately 14,163 individuals (5,252 male, 8,911 female; ages 16–95) that supports percentile-based interpretation of personality profiles in Australian populations.

Citation:

• Johnson JA. Measuring thirty facets of the Five Factor Model with a 120-item public domain inventory: Development of the IPIP-NEO-120. *J Res Pers*. 2014;51:78-89. doi:10.1016/j.jrp.2014.05.003.

CATI — Comprehensive Autistic Trait Inventory

Australian reference data: Yes — Australian-origin scale with Australian validation cohorts.

The CATI is an Australian-origin autistic-trait inventory developed at the University of Western Australia and the Telethon Kids Institute. The development paper (English et al., 2021) reported three studies with combined n > 2,000, and a follow-up Australian (Macquarie University) validation in autistic and non-autistic adults extended the psychometric evidence base.

Citations:

• English MCW, Gignac GE, Visser TAW, Whitehouse AJO, Enns JT, Maybery MT. The Comprehensive Autistic Trait Inventory (CATI): development and validation of a new measure of autistic traits in the general population. *Mol Autism*. 2021;12(1):37. doi:10.1186/s13229-021-00445-7.
• English MC, Poulsen RE, Maybery MT, McAlpine D, Sowman PF, Pellicano E. Psychometric evaluation of the Comprehensive Autistic Trait Inventory in autistic and non-autistic adults. *Autism*. 2025;29(12):2955-2974. doi:10.1177/13623613251347740.

ACE — Adverse Childhood Experiences

Australian reference data: Yes — better than US data.

The 2023 Australian Child Maltreatment Study (ACMS) surveyed a nationally representative sample of 8,503 Australians aged 16 and over. ACMS prevalence figures (62.2% any maltreatment, 39.4% multi-type, sub-type breakdowns) are now the appropriate Australian reference for ACE-style retrospective childhood-adversity work.

Citation:

• Haslam DM, Lawrence DM, Mathews B, Higgins DJ, Hunt A, Scott JG, Dunne MP, Erskine HE, Thomas HJ, Finkelhor D, Pacella R, et al. The Australian Child Maltreatment Study (ACMS), a national survey of the prevalence of child maltreatment and its correlates: methodology. *Med J Aust*. 2023;218(Suppl 6):S5-S12. doi:10.5694/mja2.51869.

PCL-5 / PC-PTSD-5 — PTSD Checklist (DSM-5)

Australian reference data: Endorsed cut-points but no dedicated Australian percentile paper.

Phoenix Australia (Centre for Posttraumatic Mental Health) and Open Arms (Department of Veterans' Affairs) endorse the PCL-5 and PC-PTSD-5 as recommended Australian PTSD screening and severity measures. The standard US National Center for PTSD cut-points (PCL-5 ≥31–33; PC-PTSD-5 ≥3 or ≥4) are used in Australian veteran and primary-care settings. A dedicated Australian percentile-norm paper has not been published.

Citations:

• Phoenix Australia — Centre for Posttraumatic Mental Health. *Australian Guidelines for the Prevention and Treatment of Acute Stress Disorder, Posttraumatic Stress Disorder and Complex PTSD*.
• Open Arms — Veterans & Families Counselling (Department of Veterans' Affairs). *Treating PTSD* clinician guidance.
• Australian Comorbidity Guidelines (Sydney: NDARC). PCL-5 / PC-PTSD-5 scoring and interpretation appendices.

LEC-5 — Life Events Checklist

Australian reference data: Limited; supportive AU prevalence data from NSMHWB.

The LEC-5 is a screening checklist for traumatic life events; it does not generate a severity score. Australian lifetime trauma exposure prevalence is reported in the National Survey of Mental Health and Wellbeing.

Citation:

• Australian Bureau of Statistics. *National Survey of Mental Health and Wellbeing* (cat. no. 4326.0).

RSES — Rosenberg Self-Esteem Scale

Australian reference data: Australian adolescent reference data via Young Minds Matter.

The 2nd Australian Child and Adolescent Survey of Mental Health and Wellbeing (Young Minds Matter, 2015) provides Australian adolescent self-esteem reference data via the Adolescent Self-Esteem Questionnaire derived from RSES items. A dedicated Australian *adult* RSES normative paper has not been located.

Citation:

• Lawrence D, Johnson S, Hafekost J, et al. *The Mental Health of Children and Adolescents: Report on the Second Australian Child and Adolescent Survey of Mental Health and Wellbeing (Young Minds Matter)*. Department of Health, Canberra; 2015.

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Tools where Australian practitioners still rely on overseas norms

The following commonly used self-report tools do not have a dedicated Australian normative study located at the time of writing. Australian practitioners typically apply international (usually US or UK) cut-points and percentiles. This is not a criticism of the instruments — most are well-validated internationally — it is simply an audit of where Australian-specific reference data is available.

These represent open research opportunities. Where culturally appropriate, alternative Australian-origin or Australian-validated tools should be considered first.

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A note on Australian copyright and attribution

Australian fair-dealing exceptions (research/study, criticism/review) do *not* extend to commercial reproduction of scale items — every embedded scale needs a free-use guarantee or a written/CC commercial licence. Numbers (means, SDs, percentile cut-points, prevalence percentages) are facts and are not copyrightable; you can cite them freely with attribution. Expression (item wording, verbatim tables, figures as composed) is copyrightable.

Almost all Australian Bureau of Statistics output published since 2008 is licensed under Creative Commons Attribution 4.0 International (CC BY 4.0), including K10 bands and National Health Survey prevalence figures. ABS attribution unlocks reproducible Australian prevalence content for free.

For a list of which specific instruments are free for commercial use, which require author permission, and which are in copyright dispute, see the National Center for PTSD distribution policy (PCL-5, LEC-5, PC-PTSD-5), the Pfizer 2010 release (PHQ family, GAD family), the Goldberg / ORI public-domain manifesto (IPIP), and the CORE System Trust software-licensing page.

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Where to start

If you are choosing a self-report battery for an Australian adult clinical practice and want every measure backed by Australian community reference data, the strongest starting set is:

1. K10 for general distress (with ABS bands)
2. PHQ-9 for depression (Stocker 2021)
3. GAD-7 for anxiety (Stocker 2021)
4. DASS-21 for combined depression / anxiety / stress (Crawford 2011 percentiles, where licensing permits)
5. ACE with ACMS prevalence context for trauma-informed history-taking

For Aboriginal and Torres Strait Islander clients, the K5 / MK-K5 (Brinckley 2021) and adapted PHQ-9 (Brown 2013) are the appropriate culturally-informed alternatives.

For paediatric and adolescent populations, the DASS-Y (Szabó & Lovibond 2022) is the only DASS variant with native Australian youth norms. Young Minds Matter (Lawrence 2015) provides adolescent reference data for self-esteem and several other constructs.

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Related reading

• The Complete Guide to AI Clinical Documentation in Australia
• Medicare Audit-Ready Documentation: A GP's Guide to MBS Item Number Compliance

For the assessment tools themselves (free, no login required), see the Grounded Scribe assessment library at /tools.