Data source.
Internal client intake records from Associated Counsellors & Psychologists Sydney, a multi-location private counselling and psychology practice. Records span May 2011 to December 2025. Dataset: 36,309 clients, 139,687 total appointments. Presenting issues were captured from client intake notes and classified by AI-assisted text analysis into approximately 50 categories. A single client may have more than one presenting issue recorded.
Gender classification.
Client gender was inferred from first names using the open-source gender-guesser Python library. Couple sessions were classified as "Couple." Accuracy is approximately 85–90% for common English-language first names; lower for names common across multiple genders or for non-English-language names. Approximately 8% of clients could not be confidently classified and are excluded from gender-disaggregated figures.
What this dataset is not.
It is not a random population sample. It is not a national or global mental-health study. It is not the world's largest dataset of its kind, and no claim of that nature is made anywhere in this report. It captures the people who sought, and could afford, private counselling at one Sydney practice over fifteen years.
Selection bias.
The dataset over-represents people who could pay for private counselling and under-represents people in lower-affluence Sydney suburbs and people without disposable income for therapy. It also over-represents English-speaking clients and people in inner-Sydney catchments where the practice has clinics. Findings should be read as patterns within this clientele, not as Sydney population estimates.
Practice-growth confound, and how this report addresses it.
The practice's unique-client base grew from 982 in 2011 to 2,427 in 2025 (a 2.4× increase). Raw-count growth in any one presenting issue therefore reflects both the rise of the issue and the rise of the practice. Where this report quotes raw counts (e.g. "6 burnout clients in 2011, 69 in 2025") we also quote the corresponding rate (0.6% → 2.8% of unique clients), which controls for practice growth. Headline figures and section claims lead with the rate; raw counts are shown as supporting detail. Where a metric is reported as a raw count only, treat it as directional rather than absolute.
International cross-references.
The international data cited in this report (WHO, OECD, Eurostat, UK HSE, Gallup, McKinsey, Samaritans, Movember, headspace, ABS, AIHW, NHS England, BACP, Mind, APA, CDC, NIMH, KFF, IHME, Slade et al. 2024, Rickwood et al. 2023, the Lancet Psychiatry Commission on Women's Mental Health 2026, and others listed in the References below) is not equivalent to this practice's data: methodologies, sampling frames, definitions and time windows all differ. The cross-references are presented to show directional alignment between the Sydney case-study finding and broader international evidence - not to claim like-for-like comparison. Two sources are particularly load-bearing for the anxiety claim: Rickwood et al. 2023 (PLOS ONE), which documented anxiety overtaking another presenting issue at the same primary-presenting-issue level of analysis on n=58,233 first-presenting youth at headspace nationally; and NHS Talking Therapies, which provides 11 consecutive years of presenting-problem time-series at approximately 1.8 million referrals per year in 2024–25. Exact figures, sample sizes and time windows are sourced and dated in the references list below.