3.2 Results of the comparison of related variables: thoracoscopic versus open resection
There were no statistically significant differences between the thoracoscopic resection group and the open resection group in the related preoperative variables (median [range]), including gestational age at birth (39.4 w [34.1-41.1] vs 39.3 w [35.5-41.4], P=.977), body weight (3260 g [2100-4270] vs 3240 g [2760-3860], P=.838), head circumference (33 cm [32-37] vs 34 cm [31-34], P=.785), lesion size (24.00 cm3[12.00-63.00] vs 34.85 cm3 [8.00-125.00], P=.319), CVR (0.37 [0.18-1.00] vs 0.55 [0.13-1.92], P=.266), and age at operation (10 d [5-21] vs 11 d[7-17], P=.442) (Table 2).The related intraoperative variables showed statistically significant differences between the groups. The length of the surgical incision in the thoracoscopic resection group was significantly shorter than that in the open resection group (1.4 cm [1.3-1.8] vs 6.0 cm [5.0-8.0], P=.000), and there was significantly less blood loss in the thoracoscopic resection group (3 ml [1-6] vs 5 ml [2-10], P=.030), but their operation time was significantly longer (159 min [100-220] vs 110 min [70-170], P=.003) (Fig. 2).Regarding the related postoperative variables, the postoperative ventilator days (3 d [1-6] vs 2 d [1-3], P=.159), duration of chest tube use (8 d [4-22] vs 6 d [4-15], P=.052) and length of postoperative hospital stay (12 d [10-25] vs 12.5 d [9-16], P=.425) did not significantly differ between the two groups.