Development of Bronchitis Severity Score (BSS) over the whole observational period (full analysis set)
| Visit (day) | Mean±sd BSS score points | p-value | |
| Ivy leaves cough liquid, pooled | Placebo, pooled | ||
| V1 (0) | 11.8±1.6 | 11.8±1.5 | |
| V2 (2) | 9.4±2.4 | 10.1±2.4 | 0.0525 |
| V3 (3) | 7.2±2.8 | 8.8±2.8 | 0.0002 |
| V4 (4) | 5.5±2.7 | 7.1±3.5 | 0.0002 |
| V5 (7) | 3.2±2.7 | 5.1±3.4 | <0.0001 |
| V6 (14) | 1.2±1.8 | 2.7±2.7 | <0.0001 |