Comparison of Characteristics of Connective Tissue Disease-Associated Interstitial Lung Diseases, Undifferentiated Connective Tissue Disease-Associated Interstitial Lung Diseases, and Idiopathic Pulmonary Fibrosis in Chinese Han Population: A Retrospective Study

Table 3

Comparison of presence of autoantibodies among CTD-ILD, UCTD-ILD, and IPF patients.

	CTD-ILD	UCTD-ILD	IPF	P1	P2	P3
Subject (n)	63	65	75
ANA n (%)	45 (71)	34 (52)	16 (21)	0.026	0.000	0.000
RF n (%)	26 (42)	9 (14)	7 (9)	0.001	0.000	0.403
Anti-ds-DNA n (%)	0	0	0	—	—	—
RNP n (%)	6 (10)	0	0	0.011	0.006	—
Anti-Smith n (%)	2 (3)	0	0	0.148	0.102	—
Anti-SSA n (%)	18 (28)	0	0	0.000	0.000	—
Anti-SSB n (%)	5 (8)	5 (8)	0	0.959	0.011	0.014
Anti-Scl-70 n (%)	4 (6)	4 (6)	0	0.964	0.027	0.029
ANCA n (%)	0	0	0	—	—	—
ACA n (%)	3 (5)	0	0	0.075	0.056	—
Anti-CCP n (%)	8 (13)	0	0	0.003	0.001	—
Anti-Jo-1 n (%)	2 (3)	0	0	0.148	0.120	—
AKA n (%)	6 (3)	0	0	0.011	0.001	—

P1: Possibility when comparing CTD-ILD group and UCTD-ILD group. P2: Possibility when comparing CTD-ILD group and IPF group. P3: Possibility when comparing UCTD-ILD group and IPF group.