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Sources and data notes

Primary-source library

Official reports and high-quality medical references behind every chart, calculator, and factual guide in this build.

1

Body measurements and percentiles

NCHS, Anthropometric Reference Data for Children and Adults: United States, August 2021–August 2023, Series 3, Number 50.

Height, weight, BMI, waist, sample and measurement methods

Official PDF
2

Body summary

CDC/NCHS FastStats: Body Measurements.

Official page
3

Puberty timing

NICHD, Puberty and Precocious Puberty fact sheet.

Official page
4

Growth charts

CDC Growth Charts and data tables.

Official page
5

Testosterone age table

Endotext, NCBI Bookshelf, impact of age on total testosterone by HPLC–MS/MS.

Official table
6

Harmonized testosterone range

Endocrine Society summary of harmonized reference ranges.

Official summary
7

Physical activity

NCHS Data Brief 443 and U.S. Physical Activity Guidelines.

NCHS report · Guidelines
8

Sleep duration and quality

CDC About Sleep and NCHS Data Brief 559, United States, 2024.

Recommendations · 2024 data
9

Earnings

BLS, Usual Weekly Earnings of Wage and Salary Workers, Second Quarter 2026.

Official release
10

Marriage and living arrangements

U.S. Census Bureau, 2025 Families and Living Arrangements.

Official release
11

Hair loss

MedlinePlus Genetics and American Academy of Dermatology male pattern hair loss guide.

MedlinePlus · AAD
12

Adult BMI categories

CDC Adult BMI Categories.

Official page

Geography: Most comparisons in this first release are U.S.-based because these sources provide transparent public methods and data tables. Values should not be silently generalized to every country or population.

Audience and design research

  • Young-adult online health seeking and interface preferences: 2025 JMIR scoping review identifying credibility, user-friendly design, tailored language, interactivity, privacy, and inclusivity as key characteristics. Open the review
  • Where adolescents get sexual-health information: Statistics Canada analysis of 15- to 17-year-olds, including differences between boys and girls in use of parents, friends, professionals, and other sources. Open the report
  • Puberty age ranges and sequence: MedlinePlus puberty overview from the U.S. National Library of Medicine. Open MedlinePlus
  • Breast asymmetry during puberty: American Academy of Pediatrics guidance noting that uneven development is common. Open AAP guidance