Association between cell-free DNA fetal fraction and pregnant character: a retrospective cohort study of 27,793 maternal plasmas.

Even though there exists an increasing trend in the SCA group compared with the non-trisomy group, it was not statistically significant.

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With the exception of the ≥ 30 kg/m 2 group, compared with the < 18.5 kg/m 2 group, there was a decreasing trend in the 18.5–24.9 kg/m 2 group and 25–29.9 kg/m 2 group, respectively either in the T21 group or SCA group (Fig. 5 B,D), and non-trisomy group demonstrating a steady downward trend (Fig. 5 F).

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