Table 3.

Sensor accuracy and error

Glucose sensor error/accuracy metrics
		Relative difference*	Absolute relative difference†
Rising	Mean	−8.1	11.0
	95% CI	−5.8 to −10.3	9.3–12.6
	Median	−6.6	9.7
	n (data pairs)	36	36
Falling	Mean	2.3	8.5
	95% CI	0.02–4.6	7.0–9.9
	Median	1.2	7.4
	n (data pairs)	36	36
	P rising vs. falling	< 0.001	< 0.001

^*Relative (per cent) difference is defined as [(sensor glucose − reference glucose)/reference glucose] ×100. The magnitude of relative difference was greater (and more negative) during rising vs. falling glucose, indicating that the sensor error was substantially greater when glucose was rising, at a time when lag was greater.

^†Absolute relative difference refers to absolute value of the relative difference and was lower when glucose was falling, indicating greater accuracy in that condition.