Application of total thoracoscopic ultrasonic scalpel resection in esophageal cancer patients

Table 6 Comparison of pulmonary function parameters between the two groups, mean ± SD, mL

Group	n	FVC		FEV1		MVV
		Preoperatively	Postoperatively	Preoperatively	Postoperatively	Preoperatively	Postoperatively
Observation group	66	95.45 ± 8.46	78.28 ± 7.75a	89.49 ± 9.11	76.68 ± 6.41a	86.68 ± 9.21	68.49 ± 7.11a
Control group	61	96.02 ± 10.21	62.43 ± 5.33a	88.32 ± 8.46	66.50 ± 5.78a	85.12 ± 8.78	56.37 ± 6.44a
t		0.344	13.323	0.748	9.372	0.975	10.040
P value		0.732	< 0.001	0.456	< 0.001	0.331	< 0.001

^aP < 0.05 vs pre-treatment levels in the same group.

FVC: Forced vital capacity; FEV1: Forced expiratory volume in one second; MVV: Maximal voluntary ventilation.