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Table 3 Comparison of interstitial glucose measured by FSL-CGM and reference venous blood glucose based on standard analytical approaches

From: Comparison of oral glucose tolerance test and ambulatory glycaemic profiles in pregnant women in Uganda with gestational diabetes using the FreeStyle Libre flash glucose monitoring system

 

Fasting (n = 17)

1 h post-OGTT (n = 17)

2 h post-OGTT (n = 17)

All (n = 51)

Time difference between paired samples ± SD (minutes)

8.8 ± 5.4

5.3 ± 5.0

7.9 ± 5.2

7.4 ± 5.3

Correlation coefficient (95% CI)

0.57 (0.12–0.83)

0.68 (0.30–0.88)

0.66 (0.26–0.87)

0.81 (0.69–0.89)

MAD overall (mmol/L)

−0.54

− 0.92

−0.89

− 0.78

MAD when ref. < 5.5 mmol/L (n = 21)

   

−0.58

MARD overall (%)

−12.2

−11.3

−13.2

−12.3

MARD when ref. > 5.5 mmol/L (n = 30)

   

−11.9

Within ISO 2013 criteria (%)

58.8

41.2

47.1

49.0

  1. SD standard deviation; CI confidence interval; MAD mean absolute difference; MARD mean absolute relative difference; ISO international organization of standardization