Table 4.
Relativity between PIFR0 and clinical indicators
| Clinical indicators | p value | R (95% CI) |
|---|---|---|
| Sex | 0.061 | −0.130 (−0.261, 0.016) |
| BMI | 0.312 | 0.071 (−0.076, 0.248) |
| FEV1 | 0.013* | 0.199 (0.072, 0.351) |
| FEV1, %predicted | 0.900 | −0.010 (−0.172, 0.149) |
| FEV1/FVC | 0.948 | 0.005 (−0.149, 0.169) |
| PEF | 0.008* | 0.218 (0.097, 0.356) |
| IC | 0.001* | 0.284 (0.097, 0.422) |
| RV/TLC | 0.255 | −0.098 (−0.296, 0.084) |
| CAT | 0.632 | −0.047 (−0.230, 0.162) |
| mMRC | 0.005* | −0.200 (−0.346, −0.044) |
Except for FEV1 (%predicted), which is the percentage of predicted value, the other pulmonary function parameters are absolute values
r, Spearman rank correlation coefficient; BMI, body mass index; FEV1, forced expiratory volume in 1 s; FEV1%, FEV1/predicted FEV1; FEV1/FVC, forced expiratory volume in 1 s/forced vital capacity; PEF, peak expiratory flow; IC, inspiratory capacity; RV/TLC, residual volume/total lung capacity; CAT, COPD Assessment Test; mMRC, Medical Research Council Dyspnea Scale.
*p value < 0.05