Table 2.

cfDNA Metrics in Normal and Preeclampsia Samples

Characteristic	Normal (n=22)	Preeclampsia (n=20)	P Value
Gestational age at draw, wk*	34.1±4.6	33.1±4.0	0.37
Placental‐derived fraction (%)†	20.0 (16.8–27.2)	14.3 (8.3–23.5)	0.06
Total cfDNA concentration, pg/µL†	106.5 (53–187)	1235 (419–2955)	<0.001

Data expressed as mean±standard deviation or median (interquartile range). cfDNA indicates cell‐free DNA.

^*Student t test.

^† Mann‐Whitney U test