Table 2.

The serum KL-6 value is based on the degree of severity.

KL-6	Covid-19 severity		p
	non-severe	severe
Day 0	44.85 (11.4–151.4)	45.70 (8.5–131.8)	0.895
Day 6	41.95 (4.6–157.4)	41.30 (4.6–163.7)	-
Delta	−3.2 (−66.4–39.5)	−3.1 (−109.9–111.8)	-

Note: non severe consisting of mild and moderate covid-19 severity; severe consisting of the severity of Covid-19, severe and critical categories.