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 1

Diagnostic criteria for patients with undifferentiated connective tissue disease (UCTD).

Diagnostic criteria	Presence of
Symptoms (at least one symptom)	(1) Skin rash
	(2) Arthralgia
	(3) Dry eyes/Dry mouth
	(4) Raynaud’s phenomenon
	(5) proximal muscle weakness
	(6) Leg/foot swelling
	(7) Face swelling
	(8) Oral ulceration
	(9) Hand ulcers
	(10) Mouth ulcers
	(11) Raynaud’s phenomenon
	(12) Morning stiffness
	(13) Recurrent unexplained fever
Serologic test (at least one test positive)	(1) Antinuclear antibody titer ≥1 : 160
	(2) Rheumatoid factor
	(3) Antidouble-stranded DNA
	(4) Anti-ribonucleoprotein antibody
	(5) Anti-Smith antibody
	(6) Anti-Sjoren syndrome A antibody
	(7) Anti-Sjoren syndrome B antibody
	(8) Anti-Scl-70
	(9) Anti-neutrophil cytoplasmic antibody
	(10) Anti-cyclic citrullinated peptide antibody
	(11) Anti-Jo-1
	(12) AKA