VAS question | Median (IQR) | ANOVA p value | |||||||
Healthy | Asthma | VCD | |||||||
Baseline | 8 min | Baseline | 8 min | Baseline | 8 min | Baseline | 8 min (Δ) | ||
1 | I feel I can’t get enough breath in | 0 (0) | 0 (2) | 1 (3) | 1 (18) | 29 (53) | 53 (39) | 0.001 | 0.019 |
2 | I feel like I am being strangled | 0 (0) | 0 (0) | 0 (1) | 0 (6) | 22 (52) | 49 (59) | 0.001 | 0.020 |
3 | My chest feels tight | 0 (0) | 0 (2) | 0 (1) | 0 (51) | 39 (62) | 45 (47) | <0.001 | 0.355 |
4 | My throat feels tight | 0 (0) | 0 (0) | 0 (0) | 0 (16) | 49 (68) | 64 (46) | <0.001 | 0.149 |
5 | I have a wheeze | 0 (0) | 0 (0) | 0 (0) | 14 (26) | 5 (28) | 36 (62) | 0.002 | <0.001 |
ANOVA, analysis of variance; HS, hypertonic saline; IQR, interquartile range; VAS, visual analogue scale; VCD, vocal cord dysfunction