Table 6.
Diagnostic value of anti-dsDNA isotypes, anti-C1q antibody, and low C3 and/or C4 for disease activity of SLE.
| Sensitivity | Specificity | PPV | NPV | OR (95% CI) | |
|---|---|---|---|---|---|
| Anti-dsDNA IgG | 83% | 46% | 69% | 64% | 4.029 (1.592–10.196) |
| Anti-dsDNA IgA | 42% | 80% | 75% | 48% | 2.818 (1.103–7.203) |
| Anti-C1q | 63% | 74% | 78% | 58% | 4.971 (2.025–12.202) |
| Anti-dsDNA IgG and IgA | 42% | 82% | 77% | 49% | 3.325 (1.257–8.790) |
| Anti-dsDNA IgG and anti-C1q | 54% | 79% | 79% | 54% | 8.495 (3.436–21.002) |
| Anti-dsDNA IgA and anti-C1q | 32% | 87% | 78% | 47% | 3.138 (1.053–9.356) |
| Anti-dsDNA IgG, IgA, and anti-C1q | 32% | 90% | 82% | 47% | 4.038 (1.246–13.085) |
| Low C3 and/or C4 | 80% | 71% | 81% | 69% | 9.6 (3.566–25.844) |
SLE: systemic lupus erythematosus; PPV: positive predictive value; NPV: negative predictive value; OR: odds ratio; CI: confidence interval.