puberty
Enable an AI agent to recognise puberty as a developmental process, represent an individual's reported or assessed progression and uncertainty, and identify appropriate support or professional review without inferring diagnosis or reproductive capacity.
Research draft, second pass
A second pass drafted this model: the structure a model of this thing needs, and what is known about it in the world. The line under this one says how the second half was obtained - researched against sources, or recalled without web access, in which case nothing here was read anywhere and every claim is a lead to verify. Unreviewed either way.
Researched by: Codex + Grok
Purpose and description
Enable an AI agent to recognise puberty as a developmental process, represent an individual's reported or assessed progression and uncertainty, and identify appropriate support or professional review without inferring diagnosis or reproductive capacity.
Puberty is the multi-year neuroendocrine and somatic process in which reactivation of pulsatile hypothalamic GnRH secretion drives pituitary LH and FSH, gonadal sex-steroid production and gametogenesis, secondary sexual characteristics, and the adolescent growth spurt, converting a sexually immature child into a person with adult reproductive capacity.
It can be Construct a dated, feature-specific account of pubertal changes with explicit gaps and uncertainty.; Distinguish reported observations from assessed stages and from interpretations requiring professional judgment.; Compare a trajectory with an identified, applicable reference while stating the limits of that comparison.; Explain recorded changes using developmentally appropriate language and the person's preferred terminology.; Identify practical support needs and prepare a concise account for a healthcare discussion.; Record unresolved concerns and agreed follow-up without autonomously diagnosing or changing treatment..
Distinguishing features
A puberty record concerns bodily sexual maturation; chronological age or adolescent social status alone does not establish its state.
An isolated observation such as acne, body odour or hair growth does not by itself establish the onset or stage of the overall pubertal process.
Pubertal progression is represented across specific bodily features and time, rather than inferred from a single milestone such as first menstruation.
A bodily maturation assessment does not establish gender identity, emotional maturity, consent capacity or fertility.
Changes occurring during an intervention that affects puberty require treatment context and cannot automatically be interpreted as an untreated trajectory.
Scope
+ The distinction between puberty, adolescence and isolated puberty-associated changes
+ Reported or assessed onset, sequence, pace and current progression of pubertal changes
+ Evidence provenance, assessment context and uncertainty
+ Relationships between pubertal trajectory, relevant health context and interventions
+ Puberty-specific understanding, practical needs, distress and support preferences
- Adolescence as a broader social, cognitive and developmental life stage
- Diagnosis and management of endocrine or reproductive disorders
- Fertility assessment, contraception, pregnancy and sexual behaviour
- Gender identity and sexual orientation as independent characteristics
- General growth, nutrition and chronic disease management
- Legal adulthood, consent capacity and safeguarding case management
Characteristics
- Age at first recognised change
- Age in years and months, or an estimated age interval; unknown permitted Places the observed trajectory in time while preserving uncertainty about when changes actually began.
- Pubertal feature observed
- Breast development, testicular development, genital development, pubic or axillary hair, voice change, menstruation, growth change, skin or body-odour change, other specified feature Keeps distinct developmental features separate and prevents one feature from standing in for the whole process.
- Feature-specific assessment
- Reported description or clinician-recorded stage under a named assessment framework; unassessed, uncertain and not applicable permitted Allows the agent to represent current observations without fabricating a global stage or treating self-report as a clinical examination.
- Observed progression interval
- Elapsed months between dated observations of a specified feature, with date precision Supports assessment of sequence and pace without converting missing observations into evidence of absent development.
- Assessment provenance
- Link to the person reporting, qualified assessor, dated clinical record or other identified evidence source Distinguishes remembered milestones, current self-reports and professional assessments.
- Puberty-affecting context
- Links to relevant health conditions, medications, hormone exposure or interventions; relevance confirmed, suspected or unknown Makes contextual interpretation possible without asserting an unsupported cause.
- Puberty-related support need
- Understanding changes, menstrual preparation, hygiene, clothing or equipment, privacy, emotional support, professional review, other specified need Connects the represented state to useful assistance rather than reducing puberty to staging.
- Reported impact
- Person-described comfort, distress and effects on daily activities, with date and optional named measure Preserves the individual's experience independently of how their physical trajectory is assessed.
Where this came from
wikidata · CC0 1.0
Also registered as vr.tr.puberty
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 5 bundles · 9 layers · 16 findings · 24 questions.
Pubertal process boundaries Establishes what is being recognised as puberty and which observations support that interpretation.
Age, social adolescence and isolated bodily changes can otherwise be mistaken for evidence of an established pubertal process.
Recognition of puberty
Separates the biological process from related life stages and unsupported assumptions.
Basis for pubertal identification
Record whether puberty is being discussed as a concept, suspected from observations or documented through an assessment.
- Is this an account of puberty generally or of an individual's pubertal development? definition
- What evidence supports describing the individual's changes as puberty rather than relying on age or adolescent status? boundary
Distinct developmental features
Keeps puberty-associated features distinct where their interpretation differs.
Feature-specific meaning
Record each relevant change and the limits of what it establishes about overall maturation.
- Which bodily changes are reported or assessed, and which remain unassessed? measurement
- Has hair growth, body odour, acne or a single reproductive milestone been treated as establishing more than the evidence supports? boundary
Onset and progression Represents puberty as a trajectory of changes rather than a single age or stage.
Recognising current state and deciding whether clarification is needed depend on timing, sequence and change over time.
Onset and milestones
Captures first recognised changes and subsequent milestones with temporal uncertainty.
Dated developmental observations
Record the timing of individual features without equating the date of recognition with the date of biological onset.
- What was the first recognised change, and at what age or estimated age interval was it noticed? measurement
- Which dates come from contemporaneous records and which come from later recollection? provenance
Pace and feature alignment
Represents how specific features progress and whether their recorded trajectories differ.
Longitudinal pubertal pattern
Record documented progression, reported pauses or differing progression across features without turning sparse observations into a diagnosis.
- What change is documented for each feature between observations, and over how many months? measurement
- Does an apparent pause or difference between features reflect repeated observations, inconsistent assessment methods or missing information? boundary
Assessment and interpretation Connects observations to their sources, assessment methods and relevant interpretive context.
Pubertal descriptions can be sensitive, method-dependent and misleading when interpreted without context.
Assessment basis
Distinguishes self-description, clinical assessment and reference-based interpretation.
Traceable feature assessment
Record who assessed a feature, when, by what method and under which named framework if staging was used.
- Who supplied this observation or stage, and what assessment method and date support it? provenance
- If a stage is recorded, which bodily feature and assessment framework does it apply to? definition
Reference and intervention context
Makes the basis and limitations of trajectory interpretation explicit.
Contextualised trajectory interpretation
Link relevant clinical context and any comparison reference while separating association from established explanation.
- What identified reference supports any description of timing or pace as expected or concerning, and why is that reference applicable? provenance
- Are relevant conditions, medications or hormone interventions documented, and who has assessed their relationship to the observed trajectory? provenance
Experience, support and review Represents how pubertal changes affect the person and what assistance is appropriate.
A usable puberty model must support practical decisions while respecting privacy and keeping clinical judgments with qualified professionals.
Puberty-specific experience
Captures understanding, practical difficulties and personal meaning without inferring identity from bodily development.
Expressed needs and preferences
Record the person's questions, preferred language and support needs related to particular pubertal changes.
- Which changes are confusing, uncomfortable or disruptive, and what help does the person want? action
- What terminology, privacy preferences and communication needs should guide discussion of these changes? action
Review and follow-up
Connects documented concerns to appropriate clarification, support or professional assessment.
Bounded next action
Record the reason for follow-up, the supporting evidence and the agreed next step without inventing clinical thresholds.
- What unresolved observation, symptom, progression concern or expressed distress warrants further discussion or assessment? action
- What next step has been agreed, with whom and when, and which judgment remains for a qualified professional? action
Evidence and external alignment What the world already says about this thing, gathered so the model can be checked against it.
A model that cannot be lined up against existing standards, identifiers and practice cannot be adopted by anyone who already uses them.
Reported evidence
Findings from the breadth pass, kept separate from the structural claims.
Kinds and varieties
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- typical (centile-timed) puberty
- central (gonadotropin-dependent) precocious puberty
- peripheral (gonadotropin-independent) precocious puberty
- delayed puberty
- constitutional delay of growth and puberty
- arrested or incomplete puberty
- therapeutically induced puberty
- adrenarche as a separable adrenal component of the pubertal transition (versus gonadarche)
- Which of these kinds and varieties hold for the sense of puberty this model covers, and on what evidence? provenance
Identifiers and schemes
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- Wikidata - Q18761 - Item for puberty as a biological process.
- MeSH - D011627 - Heading Puberty; narrower headings include Puberty, Precocious (D011631) and Puberty, Delayed (D011628).
- ICD-10 - E30.* - WHO ICD-10 block Disorders of puberty: E30.0 delayed puberty, E30.1 precocious puberty, E30.8 other, E30.9 unspecified. Typical puberty itself is not a diagnosis code.
- UMLS CUI - C0034011 - Concept Puberty, aligned with MeSH D011627.
- Which of these identifiers and schemes hold for the sense of puberty this model covers, and on what evidence? provenance
Standards and regulation
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- Tanner staging (Marshall and Tanner; Institute of Child Health clinical convention, not a statute) is the de facto physical-examination standard for breast, genital, and pubic-hair development.
- WHO ICD-10/ICD-11 classify disorders of pubertal timing (delayed, precocious, other), not typical puberty as a coded disease.
- Endocrine Society, Pediatric Endocrine Society, and European Society for Paediatric Endocrinology issue clinical practice guidance on evaluation and treatment of precocious and delayed puberty, including GnRH-analogue use.
- FDA and EMA product labelling governs GnRH agonists (for example leuprolide, triptorelin) indicated for central precocious puberty.
- AAP Bright Futures and equivalent well-child schedules treat pubertal staging and growth plotting as routine paediatric surveillance.
- Some medico-legal age-assessment protocols have used Tanner stage; professional bodies have warned that staging is not a reliable chronological-age test.
- Which of these standards and regulation hold for the sense of puberty this model covers, and on what evidence? provenance
Real-world use
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- Paediatric well-child visits: clinicians assign Tanner stage, measure height velocity, and counsel families on expected timing.
- Paediatric endocrinology clinics: work-up of early, late, or stalled puberty (history, bone age, LH/FSH and sex steroids, imaging when indicated).
- Oncology, haematology, and transplant follow-up: surveillance for delayed or incomplete puberty after gonadotoxic therapy or cranial irradiation.
- Treatment: GnRH analogues to pause central precocious puberty; sex-steroid or gonadotropin induction when puberty is absent or incomplete.
- Public-health and anthropometric surveys: age at menarche, thelarche, or voice change as population markers of developmental tempo.
- Gender-affirming care: GnRH analogues used to pause endogenous puberty (a distinct indication from central precocious puberty).
- Sports and forensic settings have invoked pubertal status for eligibility or age estimation; both uses are scientifically and ethically contested.
- Which of these real-world use hold for the sense of puberty this model covers, and on what evidence? provenance
Typical measurements
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- Tanner breast / genital / pubic-hair stage - 1 (prepubertal) to 5 (adult); onset is stage 2 - ordinal stage
- Age at thelarche (Tanner B2) - about 8-13 in many well-nourished populations; mean near 10; under 8 years is the traditional threshold for precocious in girls - years
- Age at menarche - about 10-16; population means often near 12-13, typically 2-2.5 years after thelarche - years
- Testicular volume at onset (Prader orchidometer) - ≥4 marks gonadarche; prepubertal 1-3; adult about 15-25 - mL
- Age at testicular enlargement - about 9-14; mean near 11-12 in many European/North American series - years
- Peak height velocity - about 7-9 in girls (usually before menarche); about 8-11 in boys (later in the sequence) - cm/year
- Bone age versus chronological age - usually within about ±1-2 years in typical puberty; advanced in progressive precocious puberty - years
- Basal or stimulated LH (assay-dependent) - prepubertal basal often very low; a pubertal pattern is a nocturnal or GnRH-stimulated LH rise into the assay-specific pubertal range - IU/L
- Which of these typical measurements hold for the sense of puberty this model covers, and on what evidence? provenance
Failure modes and hazards
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- Central precocious puberty: early secondary sexual characteristics with HPG activation; untreated progressive cases advance bone age and can reduce adult height; pathologic yield is higher in boys and in very young girls.
- Peripheral precocious puberty: sex steroids from gonads, adrenal, tumour, or exogenous exposure without hypothalamic GnRH drive (for example McCune-Albright syndrome, poorly controlled CAH, hCG-secreting tumours).
- Delayed or absent puberty from hypogonadotropic hypogonadism, primary gonadal failure (Turner syndrome, Klinefelter syndrome, gonadectomy, chemotherapy), chronic illness, or undernutrition.
- Misclassification: isolated premature thelarche or premature adrenarche treated as true precocious puberty, or constitutional delay treated as permanent hypogonadism.
- Psychosocial harm: teasing, early sexual attention, anxiety, and family distress around timing that is early, late, or atypical.
- Iatrogenic harm: GnRH-analogue effects on growth tempo and bone mineral accrual; under- or over-replacement of sex steroids in induced puberty.
- Unsafe use of Tanner stage as a clock for chronological age in immigration or criminal proceedings.
- Which of these failure modes and hazards hold for the sense of puberty this model covers, and on what evidence? provenance
Regional variation
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- Secular trend: mean age at menarche fell with improved nutrition and health in many countries over the 19th-20th centuries and has largely plateaued in several high-income populations.
- Within the United States, population studies have reported earlier average thelarche in non-Hispanic Black girls than in non-Hispanic White girls, which has fed debate over whether the clinical cutoff for precocious puberty should vary by group.
- Traditional European cutoff for precocious puberty in girls is before age 8 (boys before 9); some North American practice has used earlier cutoffs in selected groups after late-20th-century office-based studies.
- Later menarche remains common where undernutrition, high infectious burden, or high altitude slow growth.
- Cultural recognition often tracks menarche, voice change, or initiation rites rather than Tanner stage; biomedical staging is clinic-centred and not universal household language.
- Access to bone-age radiography, gonadotropin assays, MRI, and GnRH analogues is highly uneven between health systems.
- Which of these regional variation hold for the sense of puberty this model covers, and on what evidence? provenance
Neighbouring kinds and how to tell them apart
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- adolescence - Adolescence is a psychosocial and legal age band; puberty is the biological HPG-driven somatic process. A person can be adolescent before, during, or after pubertal completion.
- adrenarche / pubarche - Adrenarche is the rise in adrenal androgens that can produce pubic/axillary hair and apocrine odour without gonadal activation. Separate from gonadarche by prepubertal testes/ovaries, prepubertal LH/FSH, and lack of true breast or genital Tanner progression.
- isolated premature thelarche - Breast tissue appears, usually in toddlers or young girls, without growth acceleration, advanced bone age, or progressive Tanner change. True central precocious puberty shows tempo: rising Tanner stage, growth spurt, and a pubertal LH pattern.
- lipomastia (adipose chest tissue) - Palpation: glandular breast bud is firm and subareolar; fat is softer and more diffuse. Imaging or follow-up is used when the distinction is unclear in children with obesity.
- menarche - Menarche is a single event (first menses), usually late in the female sequence, not the process of puberty. Puberty in girls ordinarily begins with thelarche years earlier.
- constitutional delay of growth and puberty versus pathologic hypogonadism - Constitutional delay is a late-but-intact tempo, often familial, with eventual spontaneous progression. Permanent hypogonadism fails to progress; distinction may require time, family history, and endocrine testing rather than a single visit.
- Which of these neighbouring kinds and how to tell them apart hold for the sense of puberty this model covers, and on what evidence? provenance
Sources
- Marshall WA, Tanner JM. Variations in the pattern of pubertal changes in girls. Archives of Disease in Childhood. 1969. BMJ Publishing Group / Royal College of Paediatrics and Child Health. - Canonical staging of female puberty (breast and pubic-hair sequences), typical ages and tempo, and the clinical distinction of stages still used as Tanner stages.
- Marshall WA, Tanner JM. Variations in the pattern of pubertal changes in boys. Archives of Disease in Childhood. 1970. BMJ Publishing Group / Royal College of Paediatrics and Child Health. - Canonical staging of male puberty (genital and pubic-hair sequences), typical ages, and testicular enlargement as the usual first sign.
- Carel JC, Léger J. Precocious puberty. New England Journal of Medicine. 2008. Massachusetts Medical Society. - Clinical split of central versus peripheral precocious puberty, diagnostic approach, and height and psychosocial hazards of untreated early puberty.
- Palmert MR, Dunkel L. Delayed puberty. New England Journal of Medicine. 2012. Massachusetts Medical Society. - Clinical definition of delayed puberty, constitutional delay versus hypogonadism, and induced-puberty practice.
- Puberty (MeSH Unique ID D011627). Medical Subject Headings. U.S. National Library of Medicine. - Controlled-vocabulary identifier and scope note for puberty as a biomedical concept, including nested terms such as precocious and delayed puberty.
- Puberty (Q18761). Wikidata. Wikimedia Foundation. - Cross-wiki item identifier for puberty and outgoing links to MeSH and other authority files.
What the second pass must settle
- Which authoritative references should govern timing and progression comparisons, and how should their population coverage and limitations be represented?
- Which puberty assessment frameworks should be supported, and how should feature-specific stages, self-report and disagreements between assessors be reconciled?
- How should the model represent trajectories affected by puberty suppression, hormone treatment or variations in sex development without forcing them into an unsuitable reference pathway?
- What minimum sensitive information is necessary for each agent task, and when should access, retention or sharing be restricted?
- Which evidence-based criteria should trigger routine or urgent professional review, and how should those criteria be maintained across care settings?