Table 1.

Participant Characteristics

	Maternal Age, Years ± SD	Gestational Age, Weeks ± SD	Gravity ± SD	Parity ± SD
Placental samples
Preterm labored control, n = 10	29.3 ± 8.0	30.6 ± 4.5	2.3 ± 1.4	0.4 ± 0.5
Preterm labored PE, n = 11a	27.8 ± 8.4	29.5 ± 4.8	2.3 ± 1.2	0.4 ± 0.5
	NS	NS	NS	NS
Maternal plasma
Preterm labored control, n = 5	27.8 ± 3.4	29.4 ± 4.9	2.5 ± 2.5	1.0 ± 1.4
Preterm labored PE, n = 6b	31.0 ± 7.6	28.8 ± 5.0	3.0 ± 1.8	1.5 ± 1.0
	NS	NS	NS	NS
Placental samples
Term control, n = 5	34.8 ± 5.6	38.6 ± 0.9	2.8 ± 1.3	1.2 ± 1.3
Term PE, n = 5c	29.8 ± 6.9	37.6 ± 0.7	2.8 ± 2.0	0.8 ± 1.3
	NS	NS	NS	NS
Placental samples
Term no labor, n = 5	32.0 ± 5.0	39.0 ± 0.0	2.6 ± 1.1	1.0 ± 0.7
Term with labor, n = 5	28.4 ± 6.3	40.6 ± 1.0	2.8 ± 1.6	1.6 ± 1.5
	NS	P < .01	NS	NS

Abbreviations: NS, nonsignificant difference; PE, preeclampsia; SD, standard deviation; HELLP, hemolysis, elevated liver enzymes, low platelets; IUGR, intrauterine growth restriction.

^a One participant had HELLP, 2 had IUGR, and 1 had HELLP with IUGR.

^b One participant had IUGR and 1 had HELLP with IUGR.

^c One participant had HELLP.