Table 3. Spirometry results depending on the amount of protein intake in patients with mild to moderate chronic obstructive pulmonary disease.
| Variable | Total, n=2,069 | LPI group, n=523 | Non-LPI group, n=1,546 | P value |
|---|---|---|---|---|
| FVC % predicted | 90.4±13.5 | 89.9±14.4 | 90.6±13.2 | 0.284 |
| FEV1% predicted | 78.8±13.7 | 78.4±14.7 | 78.9±13.3 | 0.509 |
| ≥80% | 943 (45.6) | 231 (44.2) | 712 (46.1) | 0.454 |
| <80% and ≥50% | 1,126 (54.4) | 292 (55.8) | 834 (53.9) | 0.454 |
| FEV1/FVC | 0.64±0.06 | 0.63±0.06 | 0.64±0.06 | 0.015 |
| FEV1/FVC < LLN (%) | 1,203 (58.1) | 325 (62.1) | 878 (56.8) | 0.032 |
Data are presented as means ± standard deviations or numbers (%). LLN prediction equations: 125.77628 – 0.36304 × age (years) – 0.17146 × height (cm) for men; 97.36197 – 0.26015 × age (years) – 0.01861 × height (cm) for women. LPI, low protein intake; FEV1, forced expiratory volume in 1 second; FVC, forced vital capacity; LLN, lower limit of normal.