Table 1. Effect of storage time on HbA1c concentration in frozen/thawed samples.
| Storage time, weeks | HbA1c concentration, mmol/mol | ||
|---|---|---|---|
| Fresh samples | Frozen/thawed samples | P | |
| 2–5 weeks (N = 40) |
36.1 (34.4–58.5) | 36.0 (34.4–58.5) | 0.270 |
| 6–9 weeks (N = 45) |
45.3 (38.8–61.7) | 46.4 (37.7–48.4) | 0.390 |
| 10–12 weeks (N = 43) |
45.3 (36.6–55.2) | 45.3 (36.1–54.1) | 0.130 |
| 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. | |||