Nailfold capillaroscopy characteristics by interstitial lung disease (ILD) group
| Total | CTD-ILD | Non-CTD-ILD | CTD-ILD versus non-CTD-ILD p-value | ||
| IPAF | IIP | ||||
| Subjects n | 94 | 26 | 27 | 41 | |
| Density | |||||
| Number per mm | 6.7±1.4 | 5.6±1.6 | 6.8±1.1 | 7.3±0.9 | <0.001 |
| Giant capillaries | |||||
| Present n (%) | 38 (40.4) | 16 (61.5) | 12 (44) | 10 (24.4) | 0.018 |
| Number per patient | 2.9±6.3 | 7.0±1.1 | 2.8±6.1 | 0.5±8.9 | <0.001 |
| Avascular areas | |||||
| Present n (%) | 36 (38.3) | 15 (57.7) | 12 (44.4) | 9 (22.0) | 0.031 |
| Number per patient | 1.3±2.2 | 2.7±3.2 | 1.2±1.6 | 0.5±1.1 | <0.001 |
| Microhaemorrhages | |||||
| Present n (%) | 72 (76.6) | 24 (92.3) | 18 (66.7) | 30 (73.2) | 0.030 |
| Number per patient | 5.8±12.1 | 4.9±6.7 | 8.2±18.0 | 4.9±9.9 | 0.640 |
| Abnormal capillary shapes | |||||
| Present n (%) | 90 (95.7) | 26 (100) | 24 (88.9) | 40 (97.6) | 0.573 |
| Mode score | 0.7±0.8 | 1.2±0.8 | 0.7±0.8 | 0.4±0.6 | <0.001 |
Data represented as mean±sd unless otherwise stated. CTD-ILD: connective tissue disease associated ILD; IPAF: interstitial pneumonia with autoimmune features; IIP: idiopathic interstitial pneumonia.