Table 1: Frequency of each type of block, classified according to the vocal fold position and the proportion of blocks with glottal closure and opening, in the 12 adults who stutter included in this study.
| Age (years) | Stuttering | Glottal closure | Glottal opening | ||
| Severity | Dystonic type (Number) | Intermediate type (Number) | Lateral type (Number) | ||
| Case 1 | 49 | 58.3% | 11 | 10 | 2 |
| Case 2 | 45 | 11.9% | 4 | 3 | 1 |
| Case 3 | 34 | 8.3% | 2 | 2 | 0 |
| Case 4 | 24 | 6% | 3 | 2 | 0 |
| Case 5 | 20 | 3.6% | 1 | 0 | 2 |
| Case 6 | 29 | 3.6% | 1 | 2 | 0 |
| Case 7 | 30 | 3.6% | 2 | 1 | 0 |
| Case 8 | 26 | 2.4% | 1 | 0 | 1 |
| Case 9 | 37 | 2.4% | 1 | 1 | 0 |
| Case 10 | 29 | 2.4% | 0 | 2 | 0 |
| Case 11 | 27 | 1.2% | 0 | 1 | 0 |
| Case 12 | 26 | 1.2% | 0 | 1 | 0 |
| Total | 27 | 25 | 6 | ||
| Proportion of blocks | 46.6% | 53.4% | |||