IDEEA Accuracy

IDEEA Accuracy

Detectable types

Accuracy

Unique Features

Additional Info

Geriatric Study

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Capabilities and Accuracy


Accuracy of Speed Measurement
	The accuracy of speed measurement is 99.3±3.6% (N=112). Speed predicted by IDEEA compared with the actual speed while a subject (male, 72kg, 174cm, 43yr) walks and runs on a treadmill.


Energy expenditure and work estimation
	The accuracy in energy expenditure estimation is 98.1±5.3%. Comparison of EE predicted by IDEEA and measured by a room calorimeter. Error = -2.52%, absolute error \|error\| = 6.9%. The major error was caused by low efficiency during continuous sit/stand cycles.


Cumulative EE (total calories consumed)
	Cumulative results (integration) of the same measurement above. Note error is less than 3%, due to the cancellation of positive and negative errors.

Accuracy in Activity Type Detection (76 subjects)

(Detailed info on accuracy validation can be found from Obesity Research Journal, Vol. 11, No. 1, pp 33-40, Jan. 2003)

Primary	Secondary	Accuracy	Primary	Secondary	Accuracy
*Sitting*	Upright (normal)	99.40%	Leaning	Left shoulder against wall	98.71%
	Left leg over right leg	99.11%		Right shoulder against wall	100.00%
	Right leg over left leg	98.55%		Two elbows on a counter	99.28%
	Elbows on knees	99.28%		Average	99.33%
	Left heel up	99.28%
	Right heel up	100.00%	Lying Down	Facing up	100.00%
	Both heels up	99.28%		On right shoulder	99.12%
	Both feet elevated	98.55%		Facing down	99.28%
	Average	99.18%		On left shoulder	99.28%
				Average	99.23%
*Standing*	Upright (normal)	99.03%
	Left foot on a step	100.00%	Limb movement	Sit move left leg	99.60%
	Right foot on a step	99.57%		Sit move right leg	100.00%
	Average	99.53%		Sit move both legs	99.26%
				Stand move left leg	98.16%
*Reclining*	Both feet on the ground	95.63%		Stand move right leg	99.90%
	Left leg over right leg	99.23%		Average	99.14%
	Right leg over left leg	96.84%
	Average	97.23%

Accuracy in Gait Identification (69 subjects)

(Detailed info on accuracy validation can be found from Obesity Research Journal, Vol. 11, No. 1, pp 33-40, Jan. 2003)

Type of Gait	Actual Number	Number Detected	Rate of Detection
Walking	16,179	16,131	99.66 %
Running	10,421	10,341	98.99 %
Climbing Stairs	3,168	3,119	98.36 %
Descending Stairs	3,168	3,120	98.14 %
Jumping	621	600	96.60 %
Average			98.35 ± 1.14 % (mean ± SD)

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