08 Sources, methods & provenance
Where the numbers come from.
Weight99 is not a single survey and it does not hide modeled estimates behind one generic “data” label. The current production release combines stronger national reference distributions where available with one comparable global baseline system everywhere else.
CURRENT PRODUCTION RELEASE650 active models. 8 production-used sources.
This page is generated from the same committed release identity and SourceRef graph used by live Weight99 results. It lists only sources referenced by the active release; validation-only or unused registry entries are not promoted into this production source list.
585global baseline models
65stronger national models
650production population entities
HOW RESULTS ARE BUILT
Three active method tiers.
Method tier describes the shape of the production distribution behind a comparison. Weight99 exposes the tier with each result rather than pretending all estimates have the same evidence shape.
G1Published distribution points
Uses source-backed percentile knots from a production-cleared national reference and interpolates between those published points.
G2Fitted national distribution
Fits a weight distribution from source-backed national aggregate statistics such as a reported mean and standard deviation.
G4Comparable global baseline model
Builds the normalized country baseline from frozen population, BMI-threshold and height-marginal inputs so the same 2022 framework can be used across the global comparison set.
HOW CERTAINTY IS WORDED
The label follows the method.
Result class controls user-facing precision language. A modeled output is not silently rewritten as a direct measurement just because a cleaner headline would be easier.
- approximateApproximate
- The source supplies strong aggregate statistics, but Weight99 fits a continuous distribution to turn those aggregates into comparison positions.
- directDirect
- The result is generated from a source-backed production distribution that directly represents the selected reference population.
- estimatedEstimated
- The result comes from the normalized modeled country baseline rather than a direct national weight distribution for that exact reference.
PRODUCTION SOURCES
The 8 sources used by this release.
Each record below comes from the typed SourceRef catalog and is selected by the release lock itself. Source periods and population definitions remain visible because comparisons are only meaningful when their reference context travels with the number.
2022Production use cleared
Australian Bureau of Statistics
National Health Survey 2022 — Table 8: Body Mass Index, waist circumference, height and weight, by age and sex
- Geography
- Australia
- Population
- usual residents of private dwellings; Weight99 production routes use published 18+ age/sex cells
- Method/input
- official NHS physical-measure aggregates with ABS imputation for missing height/weight measurements
- Attribution
- Based on Australian Bureau of Statistics data.
Technical source identity
ABS_NHS_2022_TABLE8_ANTHROPOMETRYReference period variesProduction use cleared
Height99 / 99 Family
height99_shared_height_pack_v1 v1.0.0
- Geography
- 191 Height99 markets plus Weight99-local bridge/proxy handling for 195 sovereign routes
- Population
- male/female height marginals
- Method/input
- versioned resolved country-sex height marginals consumed as a frozen family dependency
- Attribution
- Height99 shared height package
Technical source identity
HEIGHT99_PACK312_SHARED_HEIGHT2019Production use cleared
Instituto Brasileiro de Geografia e Estatística (IBGE)
Pesquisa Nacional de Saúde 2019 — SIDRA table 8172: Percentis do peso das pessoas de 15 anos ou mais de idade, por sexo e grupo de idade
- Geography
- Brazil
- Population
- people age 15+ in corrected PNS 2019 table 8172; Weight99 production routes use published adult 18+ age/sex bands only
- Method/input
- physically measured body weight in the PNS anthropometry subsample; official survey-derived published percentiles
- Attribution
- Based on Instituto Brasileiro de Geografia e Estatística (IBGE), Pesquisa Nacional de Saúde 2019, corrected SIDRA table 8172.
Technical source identity
IBGE_PNS_2019_SIDRA_8172_WEIGHT_PERCENTILES2024Production use cleared
Japan Ministry of Health, Labour and Welfare / e-Stat
2024 National Health and Nutrition Survey — anthropometry aggregates
- Geography
- Japan
- Method/input
- official aggregate anthropometry
- Attribution
- Japan Ministry of Health, Labour and Welfare / e-Stat
Technical source identity
JPN_NHNS_2024_ANTHROPOMETRY2021–2023Production use cleared
U.S. National Center for Health Statistics
Anthropometric Reference Data for Children and Adults: United States, August 2021–August 2023
- Geography
- United States
- Method/input
- official aggregate anthropometry
- Attribution
- U.S. National Center for Health Statistics
Technical source identity
NCHS_ANTHROPOMETRIC_REFERENCE_2021_20232007–2009Production use cleared
Statistics Canada
Canadian Health Measures Survey Cycle 1 — Table 31: Measured weight of the household population, by age and sex, Canada, 2007 to 2009
- Geography
- Canada
- Population
- household population ages 6–79; Weight99 production routes use ages 20–79 by published age band
- Method/input
- direct measured anthropometry; official survey-weighted published aggregates
- Attribution
- Adapted from Statistics Canada, Canadian Health Measures Survey Cycle 1, 2007–2009. This does not constitute an endorsement by Statistics Canada of this product.
Technical source identity
STATCAN_CHMS_CYCLE1_WEIGHT_2007_20092022Production use cleared
World Bank
2022 male/female population counts used for G4 overall-adult sex mixtures
- Geography
- Weight99 G4 sovereign routes
- Population
- male/female population totals
- Method/input
- official aggregate population counts
- Attribution
- World Bank
Technical source identity
WB_2022_SEX_POPULATION2022Production use cleared
World Bank Gender Statistics
2022 sex-specific adult overweight and obesity prevalence indicators
- Geography
- 195 Weight99 sovereign routes; 191 direct World Bank routes plus approved sparse proxies in the frozen bundle
- Population
- adult male/female
- Method/input
- official published prevalence indicators used as two-threshold BMI model inputs
- Attribution
- World Bank Gender Statistics
Technical source identity
WB_G4_2022_BMI_THRESHOLDSREPRODUCIBILITY
One release identity across results and public pages.
If the production catalog changes, Weight99 creates a new release identity. Public copy should not manually preserve an old statistic after the underlying production graph changes.
- Production release
weight99-prod-f5aba6a6dee4b135- Catalog SHA-256
f5aba6a6dee4b1356f76c0c562b8767fe46f5c1082158ba72b96db2e7e8bf9b8- Used SourceRef SHA-256
94d70de7aff1dea97ca6139fe5d375e38ad49c0cf0fd9dd8be172155afa07371
ABOUT WEIGHT99
Fun first. Credible underneath.
Weight99 is a consumer comparison site for exploring how the same body weight sits across different human reference populations. The core comparison works without an account.
Higher or lower weight is descriptive here, not a verdict that one person or population is better, worse, healthier or less healthy. Weight99 is not a health score or medical assessment.
When stronger production data exists for an exact country, age and sex reference, the result can use that stronger route. Otherwise the site keeps the comparable baseline and labels modeled or approximate outputs accordingly.
WHAT THIS PAGE DOES NOT CLAIM
Transparent estimates, not invented precision.
Weight99 does not treat a modeled percentile as an individual health diagnosis, does not infer missing demographic identity, and does not mix stronger national source vintages into the normalized global ranking as if every row came from one survey.
