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| Parameter | Before intervention (mean ± SD) | After intervention (mean ± SD) | t-statistic | P-value |
| Respiratory rate (breaths/min) | 18.5 ± 2.1 | 17.8 ± 1.8 | 1.41 | 0.17 |
| Oxygen saturation (%) | 97.3 ± 1.5 | 98.1 ± 1.2 | -2.68 | 0.01 |
| Cough frequency (times/day) | 2.7 ± 0.9 | 1.9 ± 0.6 | 4.06 | <0.001 |
