{
  "dataset": "RunCalcs NHANES estimated VO2 max percentiles by age and sex",
  "version": "1.0.0",
  "generated_on": "2026-07-18",
  "geography": "United States non-institutionalized population",
  "survey_cycles": [
    "1999-2000",
    "2001-2002"
  ],
  "source_publisher": "US CDC National Center for Health Statistics",
  "source_urls": {
    "1999-2000 cardiovascular fitness": "https://wwwn.cdc.gov/Nchs/Data/Nhanes/Public/1999/DataFiles/CVX.XPT",
    "1999-2000 demographics": "https://wwwn.cdc.gov/Nchs/Data/Nhanes/Public/1999/DataFiles/DEMO.XPT",
    "2001-2002 cardiovascular fitness": "https://wwwn.cdc.gov/Nchs/Data/Nhanes/Public/2001/DataFiles/CVX_B.XPT",
    "2001-2002 demographics": "https://wwwn.cdc.gov/Nchs/Data/Nhanes/Public/2001/DataFiles/DEMO_B.XPT"
  },
  "source_sha256": {
    "1999-2000 cardiovascular fitness": "56085d2ea88e6440db3c1fa61db8daef5a1b393f4ffe28fa0031ce7fc3a5af89",
    "1999-2000 demographics": "a17bd1ebfd6007b8dc93f16259cb090678eb6c467a39363b7e932bba15febf89",
    "2001-2002 cardiovascular fitness": "0335e28e78ce7ff1ef1ac114d9b71bbf65cea1eeca79c7a937574a398363f898",
    "2001-2002 demographics": "6458dc2307cee244ab6ba26f70ec78c7b842ffc68e668bc43f0ab6b9737937d9"
  },
  "measure": "CVDESVO2, estimated maximal oxygen uptake from the NHANES submaximal treadmill protocol",
  "units": "mL/kg/min",
  "inclusion_criteria": [
    "Age 12 through 49 years",
    "NHANES cardiovascular fitness exam status equals 1 (VO2 max estimated)",
    "Non-missing CVDESVO2",
    "RIAGENDR coded 1 or 2 in the public-use demographic file",
    "Positive non-missing four-year MEC examination weight (WTMEC4YR)"
  ],
  "analysis": "Weighted P10, P25, P50, P75, and P90 within age group and recorded sex using WTMEC4YR.",
  "eligible_unweighted_sample_size": 5515,
  "limitations": [
    "VO2 max was estimated from a submaximal treadmill test, not directly measured by gas analysis.",
    "The public component is limited to participants aged 12-49.",
    "Medical and protocol exclusions mean the tested sample differs from all age-eligible participants.",
    "Percentile estimates shown here do not calculate complex-survey confidence intervals.",
    "NHANES records sex as male or female in RIAGENDR for these survey cycles."
  ]
}