| Variable | Dunn’s multiple comparison test | Number of patients |
| Anti-M3 synthetic peptide IgG versus ANA | ns | 30 |
| Anti-M3 synthetic peptide IgG versus anti-Sm | Yes (P < 0.05) | 30 |
| Anti-M3 synthetic peptide IgG versus APL | Yes (P < 0.05) | 30 |