Table 3 Spearman’s rank correlation coefficient (ρ/p values) for BMI, LAA% and WA% in patients with COPD
ρp Valueρp Valueρp Value
Age (years)0.0400.57210.0500.4813−0.0220.7802
Smoking Index (pack-years)−0.0270.07010.0920.1940−0.0120.8772
Height (cm)0.0920.19580.2250.0037
Weight (kg)0.456<0.0001−0.0170.8255
BSA (m2)0.2660.0001−0.0940.2303
FEV1 (l/s)0.280<0.00010.318<0.00010.1640.0356
FEV1 (%predicted)0.315<0.00010.306<0.00010.1760.0241
FEV1/FVC (%)0.384<0.00010.495<0.0001−0.0090.9098
RV/TLC (%)0.1950.00570.1700.01590.2620.0007
Tlco (mmol/min/kPa/l)0.337<0.00010.642<0.00010.2600.0007
WA% (%)0.1110.1560.1830.0019
LAA% (%)0.557<0.0001
  • Smoking Index  =  (the average number of packs smoked/day (20 cigarettes/pack) × years of smoking).

  • BMI, body mass index; BSA, body surface area; FVC, forced vital capacity; FEV1, forced expiratory volume in 1 s; LAA%, percentage of low attenuation area; RV, residual volume; TLC, total lung capacity; Tlco, carbon monoxide transfer coefficient, bold text indicate significant correlations; WA%, percentage of wall area.