Impact of minimally invasive surgery on immune function and stress response in gastric cancer patients

Table 3 Comparison of immune function between two groups, mean ± SD

Indicator	Minimally invasive surgery group	Open surgery group	t value	P value
IgA (ng/L)
Preoperative	4.25 ± 1.15	4.31 ± 1.33	0.615	> 0.05
Postoperative 3 d	3.87 ± 0.72a	3.13 ± 0.51a	5.897	< 0.05
IgG (ng/L)
Preoperative	20.97 ± 2.64	21.04 ± 2.57	0.338	> 0.05
Postoperative 3 d	17.81 ± 2.54a	13.45 ± 2.67a	6.208	< 0.05
IgM (ng/L)
Preoperative	3.31 ± 0.56	3.27 ± 0.79	0.736	> 0.05
Postoperative 3 d	2.76 ± 0.36a	2.18 ± 0.51a	6.083	< 0.05

^aP < 0.05 vs the same group.