Table 1.

Migration distance (mean ± SEM) of chemotactic neutrophils towards different gradients of IL-8 and fMLP.

		Migration distance (μm)
Chemoattractant	Concentration	Newborn infants	Adults	P value
IL-8	0	145 ± 15	223 ± 18	NS
IL-8	0.1 μM	221 ± 30	724 ± 155	<.01
IL-8	1 μM	412 ± 61	890 ± 130	<.001
fMLP	0	167 ± 13	215 ± 24	NS
fMLP	0.01 μM	186 ± 10	189 ± 16	NS
fMLP	0.1 μM	339 ± 42	359 ± 59	NS
fMLP	1 μM	270 ± 20	373 ± 82	NS