Table 2.

Changes in the angiogenic factors (sFlt-1 and PlGF) between the preterm ($<$ 37 weeks) or term ($\ge$ 37 weeks) of preeclampsia.

Angiogenic factors		MD (95% CI)	Heterogeneity
		I${}^2$	p-value
sFlt-1	$<$ 37 Wk of gestation	1.71 (0.63, 2.72)	98.3	$<$ 0001
	$\ge$ 37 Wk of gestation	0.44 (–0.60, 1.48)	97.7	$<$ 0001
PlGF	$<$ 37 Wk of gestation	–1.01 (–1.46, –0.56)	91.6	$<$ 0001
	$\ge$ 37 Wk of gestation	–0.85 (–1.73,0.03)	96.8	$<$ 0001
Note: MD: The mean difference;
sFlt-1: Soluble fms-like tyrosine kinase 1; PlGF: Placental growth factor.