Effect of two surgical approaches on the lung function and prognosis of patients with combined esophagogastric cancer

Table 3 Comparison of pulmonary function parameters between two groups of patients (mean ± SD)

Group	n	Preoperative	1 mo after operation	t value	P value	Preoperative	1 mo after operation	t value	P value
		FEV1 (%)				MVV (%)
A group	70	95.66 ± 8.64	90.21 ± 8.50	3.734	0.000	98.16 ± 9.26	93.48 ± 9.11	2.992	0.003
B group	68	97.03 ± 8.11	86.30 ± 7.76	7.937	0.000	96.32 ± 8.58	88.75 ± 8.36	5.248	0.000
t value		-0.960	2.820			1.210	3.175
P value		0.339	0.006			0.228	0.002
		FVC (%)				VC (%)
A group	70	97.34 ± 8.14	92.36 ± 6.06	4.067	0.000	93.06 ± 4.85	90.01 ± 4.43	3.854	0.000
B group	68	99.03 ± 7.93	89.51 ± 7.24	7.359	0.000	94.41 ± 5.00	88.26 ± 5.25	7.048	0.000
t value		-1.235	2.510			-1.610	2.119
P value		0.219	0.013			0.11	0.036

FEV1: First second; MVV: Maximum ventilation volume; FVC: Forceful lung volume; VC: Lung volume.