Table 2.
Comparison of PFT values between participants according to CT-measured skeletal muscle index (SMICT) quartiles.
| Variable | Total (n = 1907) | SMICT quartiles | p for Trend | |||
|---|---|---|---|---|---|---|
| Q1 (n = 478) | Q2 (n = 476) | Q3 (n = 476) | Q4 (n = 477) | |||
| FVC, liters | 3.9 ± 0.8 | 3.6 ± 0.7 | 3.8 ± 0.7 | 4.0 ± 0.8 | 4.1 ± 0.8 | <0.001 |
| FVC, % predicted | 96.8 ± 11.5 | 95.0 ± 11.4 | 96.7 ± 11.3 | 97.3 ± 11.9 | 97.9 ± 11.2 | <0.001 |
| Predicted FVC(%) < 80% | 101 (5.3%) | 35 (7.3%) | 24 (5.0%) | 25 (5.3%) | 17 (3.6%) | 0.016 |
| FEV1, liters | 3.1 ± 0.7 | 2.9 ± 0.6 | 3.0 ± 0.6 | 3.1 ± 0.6 | 3.3 ± 0.7 | <0.001 |
| FEV1, % predicted | 104.2 ± 13.7 | 102.9 ± 14.0 | 103.7 ± 13.5 | 104.4 ± 14.2 | 105.7 ± 13.0 | 0.002 |
| Predicted FEV1 (%) < 80% | 64 (3.4%) | 21 (4.4%) | 19 (4.0%) | 15 (3.2%) | 9 (1.9%) | 0.023 |
| FEV1/FVC (%) | 79.7 ± 6.5 | 79.5 ± 6.4 | 79.3 ± 6.1 | 79.5 ± 6.5 | 80.3 ± 6.8 | 0.061 |
| FEV1/FVC < 70% | 105 (5.5%) | 28 (5.9%) | 24 (5.0%) | 28 (5.9%) | 25 (5.2%) | 0.828 |
Data are presented as the mean ± standard deviation or as a percentage (%). Cutoff values of SMICT quartiles (cm2/(kg/m2)) for males, 8.53, 9.29, 10.15; and for females, 7.26, 7.94, 8.94.