The Diagnostic Value of the Interstitial Biomarkers KL-6 and SP-D for the Degree of Fibrosis in Combined Pulmonary Fibrosis and Emphysema

Table 5

Correlation of composite physiologic index with KL-6 and SP-D.

	Spearman rank correlation coefficient
	KL-6	SP-D	KL-6xSP-D
CPI	0.461	0.337	0.562
	𝑃=0.005	𝑃=0.04	𝑃=0.0006

CPI: composite physiologic index.
KL-6xSP-D: the combined product of KL-6 and SP-D.