Clinical validation
The studies that validate WVI and the sensor accuracy claims.
Last updated: 2026-04-07
Why this page exists
A wellness device should not make claims it cannot back up. Wellex publishes the methodology and the third-party reference checks for every metric we surface to members.
Sensor accuracy studies
| Metric | Reference standard | Result |
|---|---|---|
| Heart rate (steady) | ECG chest strap | ±2 bpm |
| HRV (rMSSD) | Polar H10 | ±8% |
| Sleep staging | Polysomnography | ~83% epoch agreement |
| SpO₂ (spot) | Pulse oximeter | ±3% (above 90% saturation) |
| Step count | Manual count | ±4% |
WVI validation
WVI is correlated against subjective wellness self-reports collected from 4 200 members across 90 days (Spearman ρ = 0.61). It is not a medical biomarker — it is a model-derived index calibrated to predict next-day perceived recovery.
What we do not claim
- Wellex is not a medical device.
- WVI is not a diagnosis.
- We do not predict illness, longevity or risk of disease.
Where to read more
The full methodology white paper lives at Whitepaper: Wellness score.