Anti-ARS positive (n = 12)

Anti-ARS negative (n = 23)

P value

Age at onset (mean±SD)

49.7 ± 13.7

62.6 ± 10.6

0.004

Male/ female

3/9

12/11

0.16

Fever (%)

25

17

0.67

Arthralgia/Arthritis (%)

42

35

0.73

Raynaud’s phenomenon (%)

50

4

0.003

Sclerodactyly (%)

17

13

1.00

Sicca syndrome(%)

25

9

0.31

KL-6 elevation (%)

91

87

1.00

ANA (%)

17

17

1.00

RF (%)

33

22

0.69

Histopathologically UIP (%, n/total available data)

25 (2/8)

59 (10/17)

0.20