. Author manuscript; available in PMC: 2008 Feb 27.

Published in final edited form as: Diabetes Technol Ther. 2005 Feb;7(1):109–114. doi: 10.1089/dia.2005.7.109

Table 1. CGMS Accuracy Summary Statistics.

(N=1,899 sensor-reference pairs)

	Mean (95% confidence interval)	Median (25^th, 75^th percentiles)
Difference^* mg/dL	−9.1 (−12.1, −6.2)	−4 (−24, 13)
Absolute Difference^† mg/dL	29.3 (26.9, 32.0)	18 (8, 38)
Relative Difference^‡	−2% (−3%, 0)	−3% (−15%, 9%)
Relative Absolute Difference^§	17% (16%, 18%)	12% (6%, 23%)
ISO Criteria Met^\|\|	72% (69%, 74%)	N/A

Difference is the sensor glucose value minus the reference glucose value.

^†

Absolute difference is the absolute value of the difference.

^‡

Relative Difference is the difference divided by the reference glucose value (expressed as percentage).

^§

Relative absolute difference is the absolute value of the relative difference (expressed as percentage).

^||

ISO criteria: for reference glucose value ≤75 mg/dL, CGMS value ±15 mg/dL and for reference glucose value >75 mg/dL, CGMS value within ±20%.