Table 4.

Results of chest X-ray test in the two groups of traditional ventilation and protective ventilation on preoperative day 0 and day 3

	Day 0			Day 3
	Traditional ventilation (n=32)	Protective ventilation (n=32)	P	Traditional ventilation (n=26)	Protective ventilation (n=29)	P
Normal	27 (84.4%)	26 (81.3%)	0.740	7 (26.9%)	17 (58.6%)	0.018
Increased thickness of interstitium	3 (9.4%)	4 (12.5%)	> 0.99	10 (38.5%)	7 (24.1%)	0.251
Disventilatory areas including minimal density change	2 (6.2%)	2 (6.2%)	> 0.99	6 (23.1%)	5 (17.3%)	0.589
Atelectasis	0 (0%)	0	–	3 (11.5%)	0	0.198
Pleural effusions	0 (0%)	0	–	0	0	–