GLOSSARY.md

Glossary

Non-Wear Time Metrics

NonwearTime(days)

• Description: Total duration when the device was not worn
• Units: Days
• Note: 0.0 indicates full compliance

NumNonwearEpisodes

• Description: Number of periods when device was removed
• Units: Count
• Note: 0 indicates continuous wear

Sunlight Exposure Metrics

TotalSunlight(mins)

• Description: Total sunlight exposure duration
• Units: Minutes

SunlightDay[Avg/Med/Min/Max](mins)

• Description: Daily sunlight statistics
  • Avg: Mean daily duration
  • Med: Median daily duration
  • Min: Minimum daily duration
  • Max: Maximum daily duration
• Units: Minutes

Movement Metrics

ENMO(mg)

• Description: Euclidean Norm Minus One - acceleration-based movement intensity
• Units: Milli-gravities (mg)
• Note: Higher values indicate more intense movement

TotalMVPA(mins)

• Description: Total Moderate-Vigorous Physical Activity duration
• Units: Minutes

MVPADay[Avg/Med/Min/Max](mins)

• Description: Daily MVPA statistics
  • Avg: Mean daily duration
  • Med: Median daily duration
  • Min: Minimum daily duration
  • Max: Maximum daily duration
• Units: Minutes

Simultaneous Sunlight + MVPA

TotalSunlightMVPA(mins)

• Description: Total sunlight exposure + MVPA duration
• Units: Minutes
• Note: Measures simultaneous sunlight exposure and MVPA. Proxy for outdoor physical activity.

SunlightMVPADay[Avg/Med/Min/Max](mins)

• Description: Daily sunlight exposure + MVPA statistics
  • Avg: Mean daily duration
  • Med: Median daily duration
  • Min: Minimum daily duration
  • Max: Maximum daily duration
• Units: Minutes

Notes

1. All values are derived using a minute-level resolution.
2. *Adjusted values compensate for missing/non-wear data.
3. MVPA = Moderate to Vigorous Physical Activity (>= 100 mg).