Table 1.

Sensor Accuracy as Derived by Relative Difference and Absolute Relative Difference from the YSI Overall and for Each Day of Use^a

Sensor day of wear	Subjects N (%)b	Matched pairs n (%)c	(%) relative difference				(%) absolute relative difference
			Mean	STD	Median	Min, max	Mean	SD	Median	Min, max
Day 1	27 (39%)	818 (38%)	−10.7	25.1	−13.5	−62.4, 186.4	19.3	19.3	15.6	0, 186.4
Day 4	21 (30%)	625 (29%)	−4.0	21.6	−6.9	−46.1, 117.5	17.0	14.0	13.7	0, 117.5
Day 7	21 (30%)	705 (33%)	−4.9	17.1	−6.4	−44.4, 103.7	13.3	11.8	10.2	0, 103.7
Overall	69	2148c	−6.8	21.9	−9.4	−62.4, 186.4	16.7	15.8	13.2	0, 186.4

YSI glucose range	Subjects N (%)b	Matched pairs n (%)c	Mean	SD	Median	Min, max	Mean	SD	Median	Min, max
40−80	39	206	5.3	37.8	−1.1	−42.6, 186.4	24.3	29.4	17.8	0.1, 186.4
81−120	57	444	−4.5	24.2	−6.0	−62.4, 131.2	17.3	17.5	13.0	0, 131.2
121−240	69	1154	−9.0	18.4	−10.3	−57.1, 131.3	16.1	12.7	13.0	0, 131.2
241−300	50	339	−11.1	13.6	−12.3	−42.0, 53.1	14.6	9.8	13.2	0, 53.1
301−400	27	175	−10.6	12.6	−10.5	−37.2, 31.8	13.7	9.1	11.5	0.2, 37.2
Overall	69	2318	−7.3	21.6	−9.7	−62.4, 186.4	16.6	15.6	13.2	0, 186.4

^aYSI in-clinic days occurred on days 1, 4, and 7 of the study. Day 1 sensor elapsed time evaluated: 2−30 hours; day 4 sensor elapsed time evaluated: 62−99 hours; and day 7 elapsed time evaluated: 139−168 hours. Glucose measurements are between 40 and 400 mg/dl.

^bN, number of subjects contributing data; n, number of matched pairs.

^cOf the matched pairs, 170 fell outside of day 1, 4, or 7 time windows.