| Subdivision | Dialect | L1 | Language or Dialect | % Correct |
|---|---|---|---|---|
| East Slavic | - | 150 m | Russian | 100%
|
| West Slavic | - | 38 m | Polish | 98%
|
| East Slavic | - | 32 m | Ukrainian | 98%
|
| South Slavic | - | 24 m | Serbo-Croatian | 97%
|
| West Slavic | - | 10 m | Czech | 96%
|
| West Slavic | - | 5.2 m | Slovak | 96%
|
| South Slavic | - | 7.8 m | Bulgarian | 94%
|
| South Slavic | - | 2.1 m | Slovene | 94%
|
| South Slavic | Serbo-Croatian | 5.6 m | Croatian | 92%
|
| South Slavic | Serbo-Croatian | 9.0 m | Serbian | 92%
|
| South Slavic | - | 1.4 m | Macedonian | 91%
|
| East Slavic | - | 3.3 m | Belarusian | 89%
|
| South Slavic | Serbo-Croatian | 2.5 m | Bosnian | 87%
|
| South Slavic | Serbo-Croatian | 240 k | Montenegrin | 49%
|
| West Slavic | Polish | 522 k | Silesian | 26%
|
| East Slavic | 70 k | Rusyn | 22%
| |
| West Slavic | - | 20 k | Sorbian | 22%
|
| West Slavic | - | 50 k | Kashubian | 18%
|