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Table 4

Summary of modified Bland-Altman comparison

BGM systemValid trialsBias (%)Coefficient of variation (%)*95% limits of agreement
Larger absolute limit boundary (%)
Lower limitUpper limit
Contour Next 312 −1.2 5.3 −11 10 11 
Accu-Chek Aviva Plus 311 −3.4 6.3 −15 15 
Walmart ReliOn Confirm (Micro) 317 2.4 6.8 −10 17 17 
CVS Advanced 318 −0.3 7.0 −13 14 14 
FreeStyle Lite 312 −6.0 7.4 −19 19 
Accu-Chek SmartView 320 −5.3 6.5 −17 17 
Walmart ReliOn Prime 312 0.4 9.5 −17 21 21 
OneTouch Verio 319 5.9 6.8 −7 21 21 
Prodigy AutoCode 312 1.2 10.3 −17 24 24 
OneTouch Ultra 2 311 −3.0 9.3 −19 17 19 
Walmart ReliOn Ultima 319 3.0 10.2 −16 26 26 
Contour Classic 320 −6.5 9.7 −23 13 23 
Embrace 319 0.9 10.0 −17 23 23 
TRUEresult 318 −8.9 8.2 −22 22 
TRUEtrack 205 −6.9 10.6 −24 15 24 
Solus V2 320 −10.1 8.1 −23 23 
Advocate Redi-Code + 319 −9.1 10.5 −26 12 26 
Gmate SMART 320 5.7 15.5 −22 43 43 
BGM systemValid trialsBias (%)Coefficient of variation (%)*95% limits of agreement
Larger absolute limit boundary (%)
Lower limitUpper limit
Contour Next 312 −1.2 5.3 −11 10 11 
Accu-Chek Aviva Plus 311 −3.4 6.3 −15 15 
Walmart ReliOn Confirm (Micro) 317 2.4 6.8 −10 17 17 
CVS Advanced 318 −0.3 7.0 −13 14 14 
FreeStyle Lite 312 −6.0 7.4 −19 19 
Accu-Chek SmartView 320 −5.3 6.5 −17 17 
Walmart ReliOn Prime 312 0.4 9.5 −17 21 21 
OneTouch Verio 319 5.9 6.8 −7 21 21 
Prodigy AutoCode 312 1.2 10.3 −17 24 24 
OneTouch Ultra 2 311 −3.0 9.3 −19 17 19 
Walmart ReliOn Ultima 319 3.0 10.2 −16 26 26 
Contour Classic 320 −6.5 9.7 −23 13 23 
Embrace 319 0.9 10.0 −17 23 23 
TRUEresult 318 −8.9 8.2 −22 22 
TRUEtrack 205 −6.9 10.6 −24 15 24 
Solus V2 320 −10.1 8.1 −23 23 
Advocate Redi-Code + 319 −9.1 10.5 −26 12 26 
Gmate SMART 320 5.7 15.5 −22 43 43 

Modified Bland-Altman analysis compares the difference (BGM reading − reference value) with the reference value rather than comparing the difference with the average of the BGM reading and the reference value. The bias is the average difference as a percent of the reference value. A bias of −5.0% means the BGM meter reading is, on average, 5% lower than the reference value.

*SD of the difference in the log-transformed measurements, which is essentially the same as the SD of the % difference = (BGM reading − reference value)/(reference value).

†95% limits of agreement define the range around the reference value containing 95% of the BGM readings.

‡Limit boundary with the larger absolute value.

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