Table 3. HbA1c levels at –20°C
| %HbA1c(–20 °C) |
| Instrument | Standard F Analyzer | Erba XL640 |
| Samples | T0 | T1m | T3m | T0 | T1m | T3m |
| 1 | 6.5 | 5.8 | 6.3 | 6.2 | 5.9 | - |
| 2 | 5.1 | 5.0 | 5.0 | 4.9 | 4.4 | - |
| 3 | 5.6 | 4.9 | 5.3 | 5.1 | 4.5 | - |
| 4 | 5.8 | 5.0 | 5.6 | 5.3 | 4.8 | - |
| 5 | 5.0 | 5.0 | 4.9 | 4.6 | 4.1 | - |
| 6 | 5.0 | 5.2 | 4.8 | 4.7 | 4.1 | - |
| 7 | 5.6 | 5.6 | 5.5 | 5.4 | 4.8 | - |
| 8 | 4.9 | 5.0 | 4.9 | 4.7 | 4.2 | - |
| 9 | 5.2 | 5.4 | 5.1 | 4.6 | 4.5 | - |
| 10 | 5.2 | 5.3 | 5.0 | 4.8 | 4.4 | - |
| Mean | 5.39 | 5.22 | 5.24 | 5.03 | 4.57 | - |
| SD | 0.49 | 0.30 | 0.46 | 0.50 | 0.53 | - |
| p-value* | | 0.212 | 0.0003 | | < 0.0001 | - |
T0: baseline; T1m: at month 1; T3m: at month 3; (-): not determined
p-value: compared to the baseline (T-test)