Table 3.

Relationship between various proteins in the amniotic fluid and spontaneous preterm delivery at < 34 weeks or ≤ 14 days of sampling in women with preterm labor without infection and/or inflammation, analyzed by multiple logistic regressions.

Variables	Spontaneous preterm delivery < 34 weeks		Spontaneous preterm delivery within 14 days
	Adjusted a	P-value b	Adjusted c	P-value d
AF FCGBP (ng/mL)	1.041 (1.001–1.082)	0.046	1.048 (1.006–1.091)	0.025
AF IGFBP-4 (ng/mL)	1.002 (1.000–1.005)	0.065
AF lipocalin-2 (ng/mL)	1.002 (1.000–1.003)	0.035	1.001 (0.999–1.002)	0.549
AF VEGFR-1 (ng/mL)	0.998 (0.996–1.000)	0.042	0.997 (0.995–1.000)	0.029

AF, amniotic fluid; FCGBP, Fc fragment of IgG binding protein; IGFBP, insulin-like growth factor-binding protein; VEGFR-1, vascular endothelial growth factor receptor 1.

^aAdjustment for nulliparity and AF interleukin-6 levels. ^b For the adjusted odds ratio. ^c Adjustment for AF interleukin-6 levels. ^d For the adjusted odds ratio.