Characteristics | IPF | NSIP | p-value# |
Subjects | 56 | 45 | |
Autoimmune serology | |||
ANA positive | 6 (11) | 9 (20) | 0.21 |
ENA positive | 2 (4) | 7 (16) | 0.04 |
dsDNA positive | 1 (2) | 3 (7) | 0.23 |
SS-A or SS-B antibody positive | 0 (0) | 1 (0) | |
Anti-Scl70 antibody positive | 0 (0) | 2 (4) | 0.11 |
Anti-Jo1 antibody positive | 0 (0) | 2 (4) | 0.27 |
RF positive | 3 (5) | 6 (13) | 0.17 |
ANCA positive | 0 | 2 (6) | 0.80 |
Any autoimmune serology positive | 12 (21) | 21 (47) | 0.007 |
CRP mg·L−1 | 36±9 | 14±14 | 0.01 |
ESR mm·h−1 | 21±21 | 16±18 | 0.23 |
Data are presented as n, n (%) or mean±sd, unless otherwise stated. ANA: antinuclear antibody; ENA: extractable nuclear antigen; dsDNA: double-stranded DNA; SS-A: anti-Ro; SS-B: anti-La; RF: rheumatoid factor; ANCA: anti-neutrophilic cytoplasmic antibody; CRP: C-reactive protein; ESR: erythrocyte sedimentation rate. #: Wilcoxon’s rank-sum test or Chi-squared test.