Correlations between areas at different levels of the upper airways on MRI and spirometry
| FEV1 (%pred) | FEV1/FVC (%pred) | FIV1/VCmax (%) | EDI (%) | |||||
| Vocal cord area | rs=0.30 (0.04 to 0.52) | p=0.02 | rs=0.33 (0.06 to 0.54) | p=0.01 | r=0.34 (0.08 to 0.58) | p=0.01 | rs=−0.31 (−0.53 to 0.05) | p=0.02 |
| Cricoid area | r=0.03 (−0.24 to 0.29) | p=0.85 | r=−0.02 (−0.29 to 0.25) | p=0.88 | r=0.03 (−0.24 to 0.29) | p=0.84 | r=−0.08 (−0.19 to 0.35) | p=0.54 |
| Tracheal deformation area | rs=0.25 (−0.16 to 0.59) | p=0.22 | rs=0.19 (−0.23 to 0.54) | p=0.37 | r=0.22 (−0.20 to 0.63) | p=0.30 | rs=−0.01 (−0.19 to 0.35) | p=0.97 |
| Trachea area | rs=0.18 (−0.09 to 0.42) | p=0.19 | rs=0.14 (−0.13 to 0.39) | p=0.30 | r=0.28 (0.01 to 0.53) | p=0.04 | rs=−0.06 (−0.32 to 0.20) | p=0.65 |
Correlations between areas at different levels of the upper airways on MRI and spirometry. Data are presented as Pearson (r) or Spearman (rs) correlation coefficient (95% CI) and p value. P values <0.05 are in bold.
EDI, Expiratory Disproportion Index; FEV1, forced expiratory volume in 1 s; FIV1, Forced inspiratory volume in 1 s; FVC, forced vital capacity; VCmax, maximal vital capacity.