Accuracy of FreeStyle Libre flash glucose monitoring in patients with type 2 diabetes who migrated from highlands to plains

Table 1 General characteristics of patients

Characteristic	Mean	SD	Minimum	Maximum
Age (yr)	53.20	8.75	34.00	81.00
Course (yr)	7.59	5.78	0.17	30.00
BMI (kg/m2)	23.81	2.74	19.00	32.20
HbA1c (%)	9.22	2.40	5.70	13.80
Hb (g/L)	149.68	15.88	115	184
HCT (%)	43.99	4.42	35.5	54.2
Fingertip blood glucose level (mmol/L)	9.78	3.75	2.08	24.12
Scanned blood glucose level (mmol/L)	8.82	3.70	2.20	24.60

BMI: Body mass index; HbA1c: Hemoglobin A1c; Hb: Hemoglobin; HCT: High hematocrit.

Table 2 Deviation of scanned blood glucose levels using the FreeStyle Libre FGM system in different blood glucose concentration groups

Group	n	MAD (mean ± SD, mmol/L)	MARD (mean ± SD, %)
< 2.77	1	1.32	63.46
2.77-4.44	42	0.85 ± 0.82	21.85 ± 21.91
4.45-6.66	171	1.13 ± 0.94	20.56 ± 18.60
6.67-11.10	508	1.10 ± 0.94	12.72 ± 10.75
11.11-16.65	252	1.53 ± 1.14	11.66 ± 8.78
16.66-22.20	35	2.74 ± 3.24	14.71 ± 17.49
> 22.20	4	3.11 ± 2.33	13.25 ± 9.61

MARD: Mean absolute relative difference; MAD: Mean absolute difference.