From: Pre-pregnancy serum complement C3 level is a predictor of preterm birth for pregnancies with systemic lupus erythematosus
Odds ratio
95%CI
p value
Age at pregnancy (per unit)
1.134
0.977–1.328
0.086
History of lupus nephritis
6.267
1.750–22.443
0.005
Low serum complement 3 (< 85 IU/ml)
4.754
1.373–16.461
0.014
Past use of steroid pulse therapy
2.640
0.708–9.845
0.148