Incidence of irritative and obstructive symptoms
| Hoehn and Yahr stage | Irritative alone2-150 | Obstructive alone2-151 | Both2-152 |
| 1 | 0/8 | 0/8 | 0/8 |
| 2 | 2/50 | 0/50 | 2/50 |
| 3 | 14/96 | 1/96 | 6/96 |
| 3.5 | 12/38 | 2/38 | 3/38 |
| 4 | 5/11 | 0/11 | 2/11 |
| Total | 33/203 (16.3%) | 3/203 (1.5%) | 13/203 (6.4%) |
↵2-150 The number of patients with score⩾7 in questions related to irritative symptoms alone (maximal score 15).
↵2-151 The number of patients with score⩾9 in questions related to obstructive symptoms alone (maximal score 20).
↵2-152 The number of patients with scores⩾7 in irritative symptom index and⩾9 in obstructive symptom index.