Table 2. HbA1c concentration in fresh and frozen/thawed samples divided according to baseline HbA1c concentrations.
| Baseline HbA1c concentration, mmol/mol | HbA1c concentration, mmol/mol | ||
|---|---|---|---|
| Fresh samples | Frozen/thawed samples | P | |
| < 39 (N = 32) |
34.4 (33.3–36.6) | 34.4 (32.2–36.6) | 0.150 |
| 39 - 47 (N = 38) |
45.3 (42.1–46.4) | 44.2 (42.1–46.4) | 0.650 |
| ≥ 48 (N = 58) |
66.1 (55.2–79.2) | 67.2 (55.2–79.2) | 0.250 |
| Results are presented as median and interquartile range (IQR). Difference in HbA1c concentrations between fresh and frozen/thawed samples were teste using the Wilcoxon test. P<0.05 was considered statistically significant. | |||