CCL4 and preeclampsia: Crude logistic analyses in the training sample revealed that women with PTB ± preeclampsia were significantly more likely (p < .05) than term controls to be low-income (as indicated by MediCal status) (OR 2.07, 95% CI 1.23–3.48) and to have lower MIP1B levels (OR 0.59, 95% CI 0.38–0.93) (Supplemental Table 1).