Table 2.

Log-transformed concentrations of CRP and SAA measured by the two analytical assays (nepholometry and ELISA) in COPD patients and healthy controls

	Entire cohort (n = 133)	COPD (n = 88)	Controls (n = 45)	p value*
logCRP (Ne)	0.5 (0.4)	0.6 (0.4)	0.3 (0.4)	0.002
logCRP (ELISA)	0.2 (0.6)	0.3 (0.5)	0.04 (0.7)	0.026
P value†	< 0.001	< 0.001	0.001
logSAA (Ne)	0.7 (0.4)	0.7 (0.4)	0.5 (0.3)	0.022
logSAA (ELISA)	0.7 (0.4)	0.8 (0.4)	0.5 (0.5)	0.003
P value†	NS	NS	NS

Data expressed as the mean (standard deviation). *p value calculated by unpaired Student's t test. †p value for the difference between nephelometry and ELISA calculated by paired Student's t test.

logCRP (Ne): log-transformed concentrations of C-reactive protein measured by nephelometry.

logCRP (ELISA): log-transformed concentrations of C-reactive protein measured by ELISA.

logSAA (Ne): log-transformed concentrations of serum amyloid A measured by nephelometry.

logSAA (ELISA): log-transformed concentrations of serum amyloid A measured by ELISA.