Table 5

Correlations between areas at different levels of the upper airways on MRI and spirometry

FEV1 (%pred)FEV1/FVC (%pred)FIV1/VCmax (%)EDI (%)
Vocal cord arears=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 arear=0.03
(−0.24 to 0.29)
p=0.85r=−0.02
(−0.29 to 0.25)
p=0.88r=0.03
(−0.24 to 0.29)
p=0.84r=−0.08
(−0.19 to 0.35)
p=0.54
Tracheal deformation arears=0.25
(−0.16 to 0.59)
p=0.22rs=0.19
(−0.23 to 0.54)
p=0.37r=0.22
(−0.20 to 0.63)
p=0.30rs=−0.01
(−0.19 to 0.35)
p=0.97
Trachea arears=0.18
(−0.09 to 0.42)
p=0.19rs=0.14
(−0.13 to 0.39)
p=0.30r=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.