Timing of fulfilment of the classification criteria compared with clinical diagnosis of SLE
| n (%) | Earlier than clinical diagnosis | At the time of clinical diagnosis | Later than clinical diagnosis |
| All patients with SLE (n=352) | |||
| ACR-1997 classified cases (n=245) | 8 (2.3) | 204 (58.0) | 33 (9.4) |
| SLICC-2012 classified cases (n=293) | 17 (4.8) | 259 (73.6) | 17 (4.8) |
| EULAR/ACR-2019 classified cases (n=289) | 19 (5.4) | 261 (74.1) | 9 (2.6) |
| Haematological SLE (n=287) | |||
| ACR-1997 classified cases (n=208) | 7 (3.4) | 173 (83.2) | 28 (13.5) |
| SLICC-2012 classified cases (n=241) | 15 (6.2) | 215 (89.2) | 11 (4.6) |
| EULAR/ACR-2019 classified cases (n=238) | 17 (7.1) | 215 (90.3) | 6 (2.5) |
| Mucocutaneous SLE (n=231) | |||
| ACR-1997 classified cases (n=174) | 6 (3.4) | 145 (83.3) | 23 (13.2) |
| SLICC-2012 classified cases (n=194) | 11 (5.7) | 174 (89.7) | 9 (4.6) |
| EULAR/ACR-2019 classified cases (n=193) | 11 (5.7) | 177 (91.7) | 5 (2.6) |
| Serosal (n=78) | |||
| ACR-1997 classified cases (n=63) | 4 (6.3) | 53 (84.1) | 6 (9.5) |
| SLICC-2012 classified cases (n=64) | 5 (7.8) | 55 (85.9) | 4 (6.3) |
| EULAR/ACR-2019 classified cases (n=64) | 5 (7.8) | 57 (89.1) | 2 (3.1) |
| Musculoskeletal (n=182) | |||
| ACR-1997 classified cases (n=152) | 6 (3.9) | 134 (88.2) | 12 (7.9) |
| SLICC-2012 classified cases (n=158) | 12 (7.6) | 141 (89.2) | 5 (3.2) |
| EULAR/ACR-2019 classified cases (n=158) | 13 (8.2) | 144 (91.1) | 1 (0.6) |
| Renal SLE (n=171) | |||
| ACR-1997 classified cases (n=118) | 2 (1.7) | 100 (84.7) | 16 (13.6) |
| SLICC-2012 classified cases (n=136) | 7 (5.1) | 121 (89.0) | 8 (5.9) |
| EULAR/ACR-2019 classified cases (n=134) | 9 (6.7) | 120 (89.6) | 5 (3.7) |
ACR, American College of Rheumatology; EULAR, European Alliance of Associations for Rheumatology; SLICC, Systemic Lupus International Collaborating Clinics.