Recommended amount of sleep for a healthy adultAASM and Sleep Research Society consensus recommendation for adult sleep duration (Watson et al., 2015).
PubMed ↗01 · Sleep
Sleep
A 0–100 view of the latest completed, non-nap sleep record.
Ovaria methodology
Ovaria currently uses total sleep duration. The score peaks around 8 hours; shorter or much longer durations lower the score. The 0–100 mapping is an Ovaria product convention.
Limitations
Duration alone cannot assess sleep quality or diagnose a sleep disorder. Age, health, pregnancy, and individual needs can change how much sleep is appropriate.
02 · Stress & HRV
Stress Load and HRV (PPG)
A wellness estimate comparing a morning camera-PPG RMSSD reading with the user’s recent morning baseline.
Ovaria methodology
The backend uses a recording captured before 12:00 PM and at least 3 prior morning readings from a rolling 60-day window. The shrinkage constants, 0–100 mapping, and display bands are Ovaria product choices.
Limitations
Camera PPG measures pulse-rate variability, not ECG HRV, and does not directly measure psychological stress. Menstrual phase, sleep, illness, exercise, caffeine, posture, breathing, and capture conditions can affect RMSSD.
lnRMSSD monitoring contextRepeated athlete HRV monitoring and interpretation of day-to-day change (Buchheit, 2014).
Article ↗HRV across the menstrual cycleSystematic review and meta-analysis of within-person changes in cardiac vagal activity across cycle phases.
PMC ↗Resting HRV measurement reliabilityShort-term HRV reliability in 15 healthy young men at rest and after exercise (Al Haddad et al., 2011).
PubMed ↗PPG pulse variability is not ECG HRVSimulation study of agreement between PPG-derived pulse-rate variability and ECG-derived heart-rate variability (Dewig et al., 2024).
PubMed ↗03 · Cycle Wellness
Cycle Wellness
A daily 0–100 wellness trend made from a 50-point cycle-history foundation and a 50-point phase-specific section.
Ovaria methodology
The score starts after 90 days and at least 2 completed cycle intervals. Foundation checks use a 21–35 day average and variation of 8 days or less. Two daily bleeding checks add up to 50 points. Missing daily bleeding input shows foundation points only, without assuming no bleeding. These thresholds and point weights are Ovaria product rules.
Limitations
The score is a wellness trend, not a validated clinical score or diagnosis. Safety flags stay separate from points, so the number must not be used to dismiss heavy, prolonged, or unexpected bleeding.
FIGO menstrual frequency and regularity terminologyFIGO systems for normal and abnormal uterine bleeding (Munro et al., 2018). The exact Ovaria formula is a product convention.
PubMed ↗04 · Cycle estimates
Phase and fertile-window estimates
Calendar estimates of cycle phase, fertile-window days, and ovulation timing when enough recorded history is available.
Ovaria methodology
Ovaria uses backend-supplied cycle history and bounded calendar geometry. Recorded bleeding is shown as recorded; future phase and fertile days are estimates rather than measurements.
Limitations
Calendar estimates do not confirm ovulation and are not contraception guidance. Cycles can vary, and estimates may be unavailable when history is limited or prediction is intentionally suppressed.
05 · Reproductive timeline
Reproductive timeline
An age-based educational view informed by STRAW+10 reproductive stages.
Ovaria methodology
Ovaria places the reported birth year on a fixed educational timeline. The age-45 transition boundary is an Ovaria display convention, not a STRAW+10 staging criterion. Age 49 is shown as a Singapore population-average menopause marker.
Limitations
STRAW+10 does not determine an individual’s stage from age alone. This is population context, not a personal prediction of menopause, ovarian reserve, fertility, or a reproductive-stage diagnosis.
STRAW+10 staging systemConsensus framework for reproductive aging stages and their menstrual and hormonal criteria (Harlow et al., 2012).
PMC ↗Singapore menopause-age referencePopulation study reporting a mean natural-menopause age of 49.0 years among surveyed Singaporean women; not an individual prediction.
PubMed ↗06 · Flow & bleeding
Flow and bleeding guidance
Descriptive flow logging plus signs that are worth raising with a clinician.
Ovaria methodology
Light and medium describe how soaked menstrual protection becomes; they are not clinical categories. Safety prompts consider duration, rapid soak-through, double protection, night changes, and large clots.
Limitations
A log cannot measure blood loss precisely or determine its cause. How bleeding affects daily life matters too; urgent or concerning symptoms need medical assessment.
Pictorial assessment of menstrual blood lossHigham, O’Brien and Shaw pictorial chart relating protection saturation to estimated menstrual blood loss.
PubMed ↗Heavy menstrual bleedingACOG patient guidance on bleeding duration, rapid soak-through, double protection, night changes, and large clots.
ACOG ↗Heavy menstrual bleeding: assessment and managementNICE NG88 guidance emphasizing symptoms, clinical assessment, and impact on quality of life.
NICE ↗