Table 1.

True positive (TP) and false positive (FP) alarms with alarm thresholds at 60 mg/dL and no forward prediction, and at 70 mg/dL with 15 minute forward prediction. At both alarm settings a TP was defined as an alarm that occurred with a confirmed blood glucose values less than or equal 60 mg/dL and a FP was defined as an alarm with a confirmed blood glucose value greater than or equal to 60 mg/dL. Sensor Enabled Therapy Intervention (SETI) was defined as a sensor alarm that resulted in an exogenous glucose bolus being given in advance of BG falling below 60 mg/dL. Sensor Enabled Therapy Alert (SETA) was defined as a sensor alarm resulting in an exogenous glucose bolus not given in time to prevent BG from falling below 60 mg/dL.

Subjects (N)	BG<40 mg/dL	BG 40–60 mg/dL	TP	FP	% detected	SETI	SETA
Alarm set at 60 mg/dL
All (64)	3	19	0	9	0	0	0
TGC (30)	3	17	0	9	0	0	0
STD (34)	0	2	0	3	0	0	0
Alarm set at 70 mg/dL
All (247)	3	46	20	334	41%	8	11
TGC (125)	2	38	18	262	45%	8	8
STD (122)	1	8	3	74	33%	0	3