Table 2. Comparison of parameters between the smoker and non-smoker groups.
| Non-smokers (Mean±SD) | Smokers (Mean±SD) | |
| Chest expansion | ||
| Chest circumference | ||
| • Axilla (cm)* | 5.71±1.62 | 4.68±2.03 |
| • Xiphoid process (cm) | 5.32±1.68 | 5.18±2.22 |
| • 10th Costal cartilage (cm) | 4.66±1.19 | 4.24±2.03 |
| Chest diameter | ||
| • AP (cm)* | 3.56±0.61 | 3.06±0.69 |
| • ML (cm)* | 3.51±0.44 | 3.18±0.85 |
| Spirometry | ||
| • FEV1 (litre) | 2.96±0.62 | 2.68±0.62 |
| • FVC (litre)* | 3.07±0.68 | 2.68±0.62 |
| Respiratory muscle strength | ||
| • MIP (cmH2O) | 77.71±25.78 | 66.85±22.52 |
| • MEP (cmH2O)* | 76.35±21.61 | 62.53±15.85 |
* = Significant difference between the smoker and non-smoker groups, p < 0.05