Maternal age showed a weak inverse association with FF; however, this relationship did not reach statistical significance (β = −0.02; 95% CI, −0.04 to 0.00; p = 0.053).
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Clinical Feasibility of Early First-Trimester Non-Invasive Prenatal Testing: Associations Between Gestational Age, Fetal Fraction, and No-Call Rates.
1
0.0530
0.0530