Table 6.

Dynamic Changes of Monocyte/Macrophages Infiltration into the Lung Tissue Before and After Inoculation of P. aeruginosa in Two Groups of Rats

Time point (h)	Young group (20,000 μm2 mean ± SD)	Aged group (20,000 μm2 mean ± SD)	t a	P value
0	5.75 ± 1.50	4.50 ± 1.29	−1.263	0.250
2	8.00 ± 0.82	6.75 ± 0.50	2.611	0.040
6	10.50 ± 1.91	8.25 ± 1.26	1.964	0.097
9	14.25 ± 0.96	10.00 ± 0.82	6.755	0.001
12	20.75 ± 1.71	13.25 ± 1.71	6.221	0.001
24	16.75 ± 0.96	15.25 ± 1.71	1.532	0.176

Data presented as mean ± SD

^aNon-parametric test