Although the rate of trisomy 13 was higher than expected (0.3% (95% CI, 0.05–0.8%) vs 0.1% expected) it did not reach statistical significance ( P = 0.069).
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Fetal fraction-based risk algorithm for non-invasive prenatal testing: screening for trisomies 13 and 18 and triploidy in women with low cell-free fetal DNA.
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0.0690
0.0690