ACL Graft Choice Risk Factors ACL-RSI Calculator (Return to Sport Readiness)AHA Pre-Participation Screening AOFAS Ankle-Hindfoot Scale ASES Elbow Score ASES Shoulder Score Acute:Chronic Workload Ratio (ACWR)Altitude Gain Guidelines Ankle Syndesmosis (High Ankle Sprain)Athlete's Heart vs HCM Beighton Score (Joint Hypermobility)Borg CR-10 Scale Borg RPE Scale (6–20)Brighton Criteria (BJHS)Buffalo Concussion Treadmill Test (BCTT)Child SCAT6 (Age 8–12)Commotio Cordis Protocol Cumberland Ankle Instability Tool (CAIT)DASH (UE Disability Index)Doha Groin Agreement ESC HCM SCD Risk Score ESC Pre-Participation Screening Energy Availability Calculator FAI Syndrome (Warwick)FAOS (Foot and Ankle Outcome Score)Fear-Avoidance Beliefs Questionnaire (FABQ)Female Athlete Triad Risk Foot Posture Index (FPI-6)Foot and Ankle Ability Measure (FAAM)Functional Movement Screen (FMS)Graduated Return-to-Play (GRTP) Protocol HAGOS (Hip and Groin Outcome Score)Hamstring Asymmetry Index Heat Index (Apparent Temp)Hip Outcome Score (HOS)Hooper Index (Athlete Wellness)I-PRRS (Psychological Readiness)IKDC (Objective Examination)IKDC (Subjective Knee Evaluation)Injury Severity KJOC Shoulder & Elbow Score KOOS (Knee Outcome Score)KOOS-PS (Physical Function Short Form)Kujala (Anterior Knee Pain Scale)LEAF-Q (LEA Screening)Lake Louise AMS Score Limb Symmetry Index (LSI)Little League Elbow Grading Lysholm Knee Score Marx Activity Rating Scale (MARS)Mayo Elbow Performance Score (MEPS)Modified Schober Test NEXUS C-Spine Criteria Neck Disability Index (NDI)One-Rep Max Estimator Osgood-Schlatter Severity Oswestry Disability Index (ODI)Ottawa Knee Rules Oxford Elbow Score Oxford Shoulder Score PAR-Q+ Readiness Questionnaire PARS-3 Youth Readiness Patellar Instability Severity Score Pitch Smart Guidelines (USA Baseball)Pittsburgh Knee Rules Post-Concussion Symptom Scale (PCSS)QuickDASH (Shoulder & UE)RED-S CAT (Clinical Assessment)Re-injury Anxiety Inventory (RIAI)Relative Age Effect (RAE)Return-to-Play Battery SANE Score (Single Assessment)SCAT6 (Sport Concussion Assessment Tool 6)SCOAT6 (Sub-acute and Office Follow-up)SEAQ-I Appetite Questionnaire STarT Back Screening Tool Session RPE (Internal Load)Sever's Disease Activity Single-Leg Hop Test Battery Standardized Assessment of Concussion (SAC)Steroid Equivalence Calculator Stinger / Burner Grading Sweat Rate and Rehydration TSK-11 (Tampa Scale for Kinesiophobia)TUE Criteria Checklist Tanner Stage Assessment Tegner Activity Scale (TAS)Training Monotony and Strain UCL Injury Risk (Medial Elbow)VISA-A (Achilles Tendinopathy)VISA-P Scale (Patellar Tendinopathy)VO2 Max VOMS (Vestibular/Ocular-Motor Screening)WADA Prohibited List Checker WBGT (Wet Bulb Globe Temp)WORC (Rotator Cuff Index)WOSI (Shoulder Instability Index)Wilks Score (Relative Strength)Wind Chill Index hEDS Diagnostic Criteria (2017)iHOT-33 (International Hip Outcome Tool)

Recent Journal Updates

JAMAJun 23, 2026

Why This Ebola Outbreak Will Be Hard to Contain

Clinical Context

We think this has broad domain relevance to Relative Age Effect (RAE).

JAMAJun 23, 2026

Hantavirus Outbreak Tests US After WHO Withdrawal

Clinical Context

We think this has broad domain relevance to Relative Age Effect (RAE).

Tropical Med & Intl HealthJun 20, 2026

Uncomplicated Malaria in Infancy and Neurodevelopment at 1 and 6 Years: Evidence From the MiPPAD Birth Cohort Study of Benin

Clinical Context

We think this has broad domain relevance to Relative Age Effect (RAE).

Relative Age Effect (RAE)

Q1

Early Born (High Advantage)

The Relative Age Effect (RAE) describes the systemic bias where children born earlier in the selection year (Q1) are more likely to be identified as "talented" due to temporary physical and cognitive maturity advantages. Late-born athletes (Q4) are often deselected prematurely despite potential long-term parity.

Guidelines & Evidence

Verified

Last Review: 2026

When to Use

Pre-participation screening in youth sports academies to identify athletes at risk of being overlooked due to birth month.

Talent identification and selection processes to ensure fairness and reduce bias towards athletes born earlier in the selection year.

Longitudinal athlete development monitoring to assess the impact of relative age on performance and dropout rates.

Research studies investigating the prevalence and consequences of RAE in various sports and age groups.

Coaching and training program design to tailor development opportunities for relatively younger athletes.

Key Indication - Identifying Selection Bias in Youth Sports

The primary clinical utility of RAE analysis is to detect and quantify selection bias in youth sports, where athletes born earlier in the competition year are disproportionately represented. This bias can lead to overrepresentation of relatively older athletes in elite pathways and increased dropout rates among relatively younger athletes. The International Olympic Committee (IOC) and many national governing bodies recommend monitoring RAE to promote equitable talent development.

When Not to Use / Contraindications

Do not use as a sole criterion for athlete selection or exclusion; RAE is a population-level phenomenon, not an individual diagnostic tool.

Avoid using in sports with no clear age-group cutoffs (e.g., open-age professional leagues) where RAE is less relevant.

Not applicable for assessing individual performance or predicting future success; RAE describes group trends, not individual outcomes.

Caution when comparing across different sports or countries with varying cutoff dates (e.g., January 1 vs. September 1).

Do not use to label or stigmatize athletes; RAE analysis should inform systemic changes, not individual judgments.

Last Comprehensive Review: 2026

Recent Journal Updates

JAMAJun 23, 2026

Why This Ebola Outbreak Will Be Hard to Contain

Clinical Context

We think this has broad domain relevance to Relative Age Effect (RAE).

JAMAJun 23, 2026

Hantavirus Outbreak Tests US After WHO Withdrawal

Clinical Context

We think this has broad domain relevance to Relative Age Effect (RAE).

Tropical Med & Intl HealthJun 20, 2026

Uncomplicated Malaria in Infancy and Neurodevelopment at 1 and 6 Years: Evidence From the MiPPAD Birth Cohort Study of Benin

Clinical Context

We think this has broad domain relevance to Relative Age Effect (RAE).

Relative Age Effect (RAE)

Q1

Early Born (High Advantage)

Guidelines & Evidence

Verified

Last Review: 2026

When to Use

Pre-participation screening in youth sports academies to identify athletes at risk of being overlooked due to birth month.

Talent identification and selection processes to ensure fairness and reduce bias towards athletes born earlier in the selection year.

Longitudinal athlete development monitoring to assess the impact of relative age on performance and dropout rates.

Research studies investigating the prevalence and consequences of RAE in various sports and age groups.

Coaching and training program design to tailor development opportunities for relatively younger athletes.

Key Indication - Identifying Selection Bias in Youth Sports

When Not to Use / Contraindications

Do not use as a sole criterion for athlete selection or exclusion; RAE is a population-level phenomenon, not an individual diagnostic tool.

Avoid using in sports with no clear age-group cutoffs (e.g., open-age professional leagues) where RAE is less relevant.

Not applicable for assessing individual performance or predicting future success; RAE describes group trends, not individual outcomes.

Caution when comparing across different sports or countries with varying cutoff dates (e.g., January 1 vs. September 1).

Do not use to label or stigmatize athletes; RAE analysis should inform systemic changes, not individual judgments.

Last Comprehensive Review: 2026