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IL-6 cytokine levels were negatively associated with infant birth weight in all women studied ≤ 34 wk of pregnancy. The relationships between IL-6 levels and birth weight were present within both subgroups as well [early-onset preeclampsia (open square symbols: R2=0.93, p<0.05); early normal pregnancy (solid black diamond symbols: R2=0.81, p<0.05)].
