Table 4.

Contextual-data descriptor table.

Attribute	Unit	Remark
Time rel	[s]	Relative time from start of measurements in seconds
Day rel	[d]	Number of days from start of measurement
Time rel	[hh:mm:ss]	Relative time from start of measurement
Date abs	[yyyy-mm-dd]	Absolute date
Time abs	[hh:mm:ss]	Absolute time
ActivityClass	–	Activity Class (0 = unknown, 1 = lying, 2 = sitting/standing, 3 = cycling, 4 = slope up, 5 = jogging, 6 = slope down, 7 = walking, 8 = sitting/lying, 9 = standing, 10 = sitting/lying/standing, 11 = sitting, 99 = not worn)
ActivityEnergyExpenditure	[kcal/d]	Activity energy expenditure (AEE) in kcal/d
Altitude	[m]	Altitude from barometer
BodyPosition	–	Body position (0 = unknown, 1 = lying supine, 2 = lying left, 3 = lying prone, 4 = lying right, 5 = upright, 6 = sitting/lying, 7 = standing, 99 = not worn)
InclinationDown	[deg]	Inclination of sensor axis down against the vertical (0–180°)
InclinationForward	[deg]	Inclination of sensor axis forward against the vertical (0–180°)
InclinationRight	[deg]	Inclination of sensor axis right against the vertical (0–180°)
MET		MET value directly calculated from regression models
MovementAcceleration	[g]	MovementAcceleration: Raw acceleration, bandpass filtered, vector magnitude
NonWearSleepWake	–	Sleep/Wake detection (0 = wake, 1 = sleep, 2 = not worn)
NonWearTime	–	Non wear detection (0 = worn, 1 = not worn)
StepCount	[steps]	Count of steps per output interval
TotalEnergyExpenditure	[kcal/d]	Total energy expenditure (TEE = BMR + AEE)
VerticalSpeed	[m/s]	Vertical speed, calculated from barometer

The attributes are the columns of the context.xlsx file in the annotation folder of each day.