Table 6.

The relative expression of cytokines after low pH and lipopolysaccharides treatments in vitro

Genes	pH 7.4		pH 5.5		SEM	P value
	0	LPS, 10 μg/mL	0	LPS, 10 μg/mL		pH	LPS	pH x LPS
IL-1β	1.13	2.75	0.62	2.36	0.259	0.104	0.001	0.103
IL-2	1.08	2.06	0.81	2.91	0.280	0.357	0.001	0.093
IL-6	0.91	1.66	1.43	1.62	0.106	0.107	0.007	0.068
IL-8	0.89	4.34	1.46	3.23	0.455	0.551	<0.001	0.088
IL-12	1.04	1.25	0.65	0.94	0.115	0.153	0.292	0.847
TNF	0.87	1.62	2.04	2.57	0.255	0.031	0.155	0.783

x which means the interaction between two factors