Table 2.
Deviation from “trueness”: Reference mean values and devices’ mean differences from reference [mg/dL (SD)] for WB and P, for the whole range and per glycemic interval.
| Device | Blood Source | Mean difference with reference (SD) | |||
|---|---|---|---|---|---|
| Whole Range (N = 100) | Hypoglycemia (N = 15) | Normoglycemia (N = 38) | Hyperglycemia (N = 47) | ||
| Reference value Mean (SD) | 175.30 (115.74) | 51.38 (14.98) | 106.15 (22.30) | 265.04 (106.39) | |
| Aviva | WB | 19.32 (28.19) | 1.38 (12.61)d | 8.87 (13.05) | 32.67 (33.67)d |
| P | −10.90 (15.20) | −6.54 (3.48) | −5.69 (6.40) | −16.31 (19.82) | |
| FreeStyle | WB | 74.15 (55.24) | 18.69 (13.60) | 40.38 (21.09) | 116.60 (48.83) |
| P | 0.89 (20.48)b | −2.00 (4.95)d | 1.49 (9.85)d | 1.19 (28.21)d | |
| Glucocard | WB | 48.18 (30.84) | 25.54 (10.62) | 40.64 (11.60) | 60.44 (39.02) |
| P | 28.10 (20.21) | 15.46 (5.97) | 24.97 (6.62) | 34.06 (26.97) | |
| Hemocue | WB | 47.83 (49.15)a | 2.75 (20.93)d | 22.08 (15.92) | 80.02 (51.00) |
| P | −10.79 (32.66) | −19.15 (9.61) | −18.49 (7.85) | −2.27 (45.07)d | |
| Ultra | WB | 38.7 (30.99) | 16.92 (13.16) | 27.15 (13.53) | 54.23 (36.56) |
| P | −64.71 (43.32) | −6.62 (11.41)d | −40.87 (17.16) | −99.81 (31.91) | |
| Verio | WB | 29.96 (32.45)a | 6.77 (11.19)d | 14.44 (10.09) | 49.25 (37.28) |
| P | −13.19 (14.42)a | −5.42 (5.47) | −8.38 (7.16) | −19.17 (17.81) | |
| Vita | WB | 38.82 (30.95) | 16.46 (12.69) | 25.15 (11.56) | 54.58 (36.25) |
| P | −59.61 (40.45) | −3.61 (9.61)d | −35.80 (13.71) | −94.13 (26.76) | |
| Optium | WB | 38.57 (34.76) | 10.85 (14.96) | 19.03 (15.32) | 61.96 (34.78) |
| P | −48.56 (31.95) | −13.46 (9.67) | −39.00 (11.99) | −65.83 (35.90) | |
| StatStrip | WB | 33.28 (30.28) | 12.62 (11.09) | 20.44 (15.21) | 49.26 (34.57) |
| P | −3.92 (26.87)c | 4.85 (4.78) | 5.62 (7.32) | −14.04 (35.64) | |
WB, whole blood; P, plasma; PBGMs, portable blood glucose meters.
a One hundred determinations were obtained for all devices, except Verio (99 WB and 98 P samples) and Hemocue (99 WB samples). Normoglycemia is defined between 73 and 143 mg/dL.
b, cAll PBGMs showed significant differences with the reference in both whole blood and plasma, for the whole glucose range, with the exception of bFreestyle (P = .665) and cStatStrip (P = .148) in plasma samples, and Vita and Ultra for the same samples in the hypoglycemic range (P = .200 and P = .059, respectively) and Hemocue (P = .729), in hyperglycemia.
d P > .05 (nonsignificant) compared with reference by glycemic ranges.