Table 2.

Comparison of surgical indicators between the two groups, mean ± SD

Group	n	Surgical duration (minutes)	Intraoperative blood loss (mL)	Chest drainage volume (mL)	Number of dissected lymph nodes
Observation group	66	165.48 ± 20.44	89.08 ± 10.23	256.34 ± 31.61	8.44 ± 0.75
Control group	61	194.63 ± 22.78	123.62 ± 15.28	310.29 ± 35.72	6.23 ± 0.61
t		7.600	15.072	9.028	18.129
P value		< 0.001	< 0.001	< 0.001	< 0.001