Table 2.

The pooled results of the serum/BALF YKL-40 levels in patients with ILD compared with those in healthy controls.

Diseases	WMD	95%CI	P value	Mann-Whitney test (P value)
Serum
IPF	130.55	60.77–200.34	<.001	0.05
CTD-ILD	50.53	40.59–60.47	<.001	0.037
Sarcoidosis	245.22	20.24–470.19	.033	NA9
COP	163.1	130.43–195.78	<.001	NA
Asbestosis-ILD	39.18	5.89–72.47	.021	NA
NSIP	144.57	137.52–151.63	<.001	NA
PAP	139.64	−421.2	.194	NA
BALF
IPF	7.43	4.60–10.26	<.001	0.05