Table 5.

Risk Ratios^a for Small-for-Gestational-Age Birth in Relation to Umbilical Cord Serum Log Cytokine Levels, by Preterm Birth Status, Infant Growth Project, Jefferson County, Alabama, 1985–1988

	Term Birthsb (n = 298)		Preterm Birthsc (n = 72)
	RR	95% CI	RR	95% CI
Interferon γ	0.86	0.67, 1.11	0.56	0.31, 1.01
Tumor necrosis factor α	1.16	0.72, 1.86	0.45	0.13, 1.56
Interleukin-12p70	0.93	0.60, 1.47	0.44	0.15, 1.23
Interleukin-4	0.86	0.68, 1.09	0.88	0.49, 1.57
Interleukin-10	0.93	0.67, 1.29	0.72	0.34, 1.54

Abbreviations: CI, confidence interval; RR, risk ratio.

^aResults were adjusted for race/ethnicity, smoking, and alcohol consumption.

^bAmong the 298 term births, 62 were small-for-gestational-age births.

^cAmong the 72 preterm births, 13 were small-for-gestational-age births.