Table 2

Sensitivity, specificity, false alarm rates, and PPV of CGM-measured hypoglycemia on 1 day for the occurrence of SH on the following day

CGM glucose readings ≤70 mg/dL on prior day (%)n of daysSensitivity*SpecificityFalse alarmPPV§
TotalNo SHSH
02,0091,99910
>03,2863,2691763%38%99.5%0.5%
≤53,2923,27814
>52,0031,9901348%62%99.4%0.7%
≤154,6134,59617
>156826721037%87%98.5%1.5%
≤305,1845,16222
>30111106519%98%95.5%4.5%
All5,2955,26827
  • *Sensitivity, Proportion of true SH events where the CGM indices correctly predicted the prior days as positive.

  • †Specificity, Proportion of days without SH where the CGM indices correctly predicted the prior days as negative.

  • ‡False alarm, Proportion of days with CGM indices predicted as positive where there were no SH in the following days.

  • §PPV, Proportion of days with CGM indices predicted as positive where there were SH events in the following days (this is 100% minus the false alarm rate).