TABLE 2

Correlations between rate of ¹⁸F-fluorodeoxyglucose uptake classified by lung regions in participants with COPD

Variable (x)	Upper lung		Middle lung		Lower lung
	r	sig	r	sig	r	sig
Fibrinogen g·L⁻¹	0.42	<0.001	0.38	<0.001	0.16	0.16
Log₁₀hsCRP mg·L⁻¹	0.31	0.005	0.31	0.005	0.09	0.41
White cell count ×10⁹·L⁻¹	0.24	0.04	0.25	0.03	0.17	0.14
Neutrophils ×10⁹·L⁻¹	0.31	0.005	0.29	0.009	0.19	0.10
FEV₁ L	−0.33	0.003	−0.18	0.10	0.02	0.89
FEV₁ % predicted	−0.26	0.02	−0.16	0.17	−0.04	0.74
6MWD m	0.28	0.01	−0.25	0.03	0.08	0.51
Perc15 score HU	−0.35	0.004	−0.11	0.38	−0.04	0.76

Pearson's bivariate test used. Strength of correlation determined by r and significance (sig) by p-value. hsCRP: high sensitivity C-reactive protein, FEV₁: forced expiratory volume in 1 s; 6MWD: 6-min walking distance.