Table 3. Comparison of the study groups in the aspect of serum and pleural YKL-40 and serum C-reactive protein levels.

Parameters	CHF (n=23)	MPE (n=22)	PPE (n=23)	TPE (n=12)
†Serum YKL-40, ng/mL	186.1 [39-233]	162.9 [33-232]	195.8 [37-234]	65.15 [35-202]*
†Pleural YKL-40, ng/mL	205.9 [123-224]*	219.6 [155-226]	219 [97-227]	219.3 [179-225]
†YKL-40pl/YKL-40s ratio	1.04 [0.82-5.46]	1.3 [0.95-6.07]	1.07[0.76-5.66]	3.38 [1.1-6.14]*
‡CRP, mg/L	4.15±3.46	6.11±4.04	15.04±10.27*	9.15±7.67
†Pleural ADA, UI/mL	13 [1-23]	13 [1-35]	15 [1-48]	45 [20-97]*

CHF, Congestive heart failure; MPE, Malignant pleural effusion; PPE, Parapneumonic effusion; TPE, Tuberculous pleural effusion; *, P values were found <0.05 between the patient groups; ^†, Serum YKL-40, pleural YKL-40 and pleural ADA levels did not distributed normally between the groups, so the results were shown as median and (min-max), The Kruskal-Wallis test and Mann-Whitney U test after Bonferroni adjustments were used for the nonparametric variables; ^‡, Serum C-reactive protein (CRP) levels distributed normally and the results were shown as mean and standart deviation, ANOVA were used for the comparison of averages for the parametric variables; pl, pleural; s, serum; ADA, adenosine deaminase.