Table 1—

GW2B and CGMS accuracy during hypoglycemia for reference glucose values ≤60 mg/dl

GW2B
CGMS (original sensors)
CGMS (modified sensors)
AllDuring intravenous insulin testOther timesAllDuring intravenous insulin testOther timesAllDuring intravenous insulin testOther times
n19210191356218138451035
Sensor glucose value
    ≤60 mg/dl44 (23%)25 (25%)19 (21%)129 (36%)89 (41%)40 (29%)22 (49%)6 (60%)16 (46%)
    61–80 mg/dl70 (36%)43 (43%)27 (30%)108 (30%)64 (29%)44 (32%)16 (36%)1 (10%)15 (43%)
    81–100 mg/dl48 (25%)25 (25%)23 (25%)65 (18%)40 (18%)25 (18%)7 (16%)3 (30%)4 (11%)
    101–120 mg/dl15 (8%)4 (4%)11 (12%)21 (6%)10 (5%)11 (8%)
    >120 mg/dl15 (8%)4 (4%)11 (12%)33 (9%)15 (7%)18 (13%)
Absolute deviation*26 (11, 40)24 (15, 35)28 (11, 46)20 (8, 37)19 (8, 35)21 (9, 37)15 (9, 24)10 (5, 29)16 (10, 24)
Values within 15 mg/dl of reference59 (31%)27 (27%)32 (35%)147 (41%)90 (41%)57 (41%)23 (51%)7 (70%)16 (46%)
  • Data are n (%) and median interquartile range.

  • *

    * Absolute value of sensor glucose minus reference glucose.