Table 2

Markers of preterm birth at mid-gestation

Mean (SD)RangeCorrelation withgestational age atdelivery
R (p value)
Markers of SLE activity
 SLEPDAI3.2 (3.1)0–100.014 (0.9)
 PGA0.43 (0.47)0–1.5−0.043 (0.8)
 C3 (mg/dl)126.8 (30.7)70–1980.16 (0.3)
 C4 (mg/dl)19.2 (8.6)7–370.32 (0.05)
 dsDNA (IU/ml)100.5 (166.9)1–618−0.028 (0.9)
Markers of inflammation
 CRP (mg/dl)1.0 (1.5)0.02–6.690.090 (0.6)
 ESR (mm/1 h)48.1 (19.9)21–1160.056 (0.7)
 Ferritin (ng/ml)20.5 (13.9)1.1–60.0−0.37 (0.05)
Markers of placental health
 Oestradiol (pg/ml)5648.2 (3021.1)906–12 0900.44 (0.01)
 AFP (ng/ml)116.2 (69.7)42.8–3430.19 (0.3)
Markers of renal function
 Creatine (mg/dl)0.55 (0.08)0.4–0.70.17 (0.3)
 Protein to creatine ratio0.18 (0.19)0.1–1.30.05 (0.8)
 Uric acid (mg/dl)3.72 (0.94)1.8–6.1−0.43 (0.02)
  • AFP, α-fetoprotein; CRP, C reactive protein; ESR, erythrocyte sedimentation rate;PGA, physician's global assessment; SLE, systemic lupus erythematosus; SLEPDAI, SLE pregnancy disease activity index.