Table 4.
Residual spirometric parameters*, spirometric pattern and severity of pulmonary restriction in the studied population. Results are shown as arithmetic mean and standard deviation.
| Spirometric variable | Group 1 (n= 87) | Group 2 (n= 88) | Group 3 (n= 88) | Group 4 (n= 86) |
|---|---|---|---|---|
| Percent predicted FEV1 | 98.97 14.1 | 99.20 18.1 | 95.81 14.5** | 95.41 12.5 |
| Percent predicted FVC | 96.19 12.9 | 96.24 16.0 | 91.33 13.9 | 90.82 10.7** |
| FEV1 residual* (mL) | -63.86 30.5 | -54.93 35.5 | -87.14 38.0 | -77.12 37.6 |
| FVC residual* (mL) | -120.86 29.8 | -115.64 36.0 | -190.39 42.7** | -167.27 38.1 |
| FEV1/FVC (%) | 0.91 0.05 | 0.91 0.05 | 0.92 0.05 | 0.92 0.05 |
| Spirometric pattern | ||||
| Normal | 42 48.28% | 43 48.86% | 30 34.09% | 33 38.37% |
| Restrictive | 45 51.72% | 45 51.14% | 58 65.91% | 53 61.63% |
| Severity of pulmonary restriction (% of predicted FVC) | ||||
| Low (≥70) | 45 51.72% | 44 48.88% | 57 64.72% | 48 55.81% |
| Moderate (≥60 <70) | 0 | 0 | 1 1.19% | 5 5.82% |
| Moderate to severe (≥50 <60) | 0 | 1 2.26% | 0 | 0 |
| Severe (≥34 <50) | 0 | 0 | 0 | 0 |
| Grave (<34) | 0 | 0 | 0 | 0 |
*
Residual = obtained minus predicted.
**
Ttest, Mann Whitney or Chi2 < 0.02 (Group 1 compared with Groups 2-4)