Effects of simulated carbon dioxide and helium peumoperitoneum on proliferation and apoptosis of gastric cancer cells

Table 3 Changes of MKN-45 proliferative viability in CO₂ groups (OD, mean± SD)

Groups	Time (d)
	1	2	3	4	5	6	7
Control	0.31 ± 0.04	0.41 ± 0.02	0.53 ± 0.09	1.38 ± 0.04	1.81 ± 0.09	2.33 ± 0.04	2.33 ± 0.06
0 mmHg	0.28 ± 0.06	0.41 ± 0.04	0.56 ± 0.06	1.37 ± 0.07	1.58 ± 0.02	2.38 ± 0.06	2.39 ± 0.08
5 mmHg	0.31 ± 0.05	0.35 ± 0.05	0.56 ± 0.04	1.34 ± 0.04	1.59 ± 0.07	2.50 ± 0.07	2.32 ± 0.04
10 mmHg	0.29 ± 0.02	0.36 ± 0.04	0.53 ± 0.05	1.27 ± 0.05	1.57 ± 0.14	2.54 ± 0.10	2.40 ± 0.03
15 mmHg	0.32 ± 0.03	0.39 ± 0.05	0.47 ± 0.05	0.68 ± 0.04b	0.80 ± 0.04b	1.16 ± 0.08b	1.42 ± 0.02b

^bP < 0.01 vs control group; OD: Optical density.