Prevalence of problems experienced when performing the self-test
| Problem | N (%) |
| Correct use of finger-prick lancet | |
| No | 6 (3.0) |
| Yes | 193 (97.0) |
| Correct collection of blood sample | |
| No | 8 (4.0) |
| Yes | 191 (96.0) |
| Correct application of buffer solution | |
| No | 31 (15.5) |
| Yes | 168 (84.5) |
| Self-test read at recommended time point | |
| No | 1 (0.5) |
| Yes | 198 (99.5) |