| Letter | % Correct |
|---|---|
| A | 100%
|
| E | 76%
|
| O | 71%
|
| I | 68%
|
| U | 67%
|
| Be | 56%
|
| Pe | 53%
|
| Ve | 53%
|
| De | 52%
|
| Ge | 51%
|
| En | 49%
|
| Er | 49%
|
| Ef | 47%
|
| Es | 45%
|
| Ya | 45%
|
| Ze | 45%
|
| Em | 44%
|
| Tse | 44%
|
| El | 43%
|
| Te | 43%
|
| Yu | 41%
|
| Ka | 39%
|
| Che | 37%
|
| Kha | 37%
|
| Zhe | 33%
|
| Sha | 31%
|
| Shcha | 28%
|
| Short I | 12%
|
| Soft sign | 11%
|