Table 2. Comparison of the study groups with transudates and exudates in the aspect of serum YKL-40, pleural YKL-40 and serum CRP levels.

Parameters	Transudate (n=23)	Exudate (n=57)	P
Serum YKL-40, ng/mL	186.1 (39-233)	153.2 (33-234)	0.422
Pleural YKL-40, ng/mL	205.9 (123-224)	219.4 (97-227)	<0.001*
YKL-40pl / YKL-40s ratio	1.04 (0.82-5.46)	1.39 (0,76-6,14)	0.054
CRP, mg/L	3 (0,18-12,3)	9 (0,02-38)	0.001*

Serum YKL-40, pleural YKL-40 and serum CRP levels did not distributed normally between the patient groups with exudates and transudates, the results were shown as median (min, max), The Kruskal-Wallis test and Mann-Whitney U test after Bonferroni adjustments were used for the nonparametric variables, transudates included the patients with congestive heart failure and exudates included the patients with malignant effusion, parapneumonic effusion and tuberculous effusion, *, P values <0.05 were accepted as significant; pl, pleural; s, serum.