ALB and pneumothorax: There were no statistically significant differences in terms of demographic factors (age, sex, smoking history, body-mass index, and serum albumin level), previous pneumothorax history (total lung collapse at the first pneumothorax and prior contralateral pneumothorax before surgery), radiographic finding (the existence of bullae on a CT scan), and surgical procedures (multiple wedge resection, PGA sheet usage, pleural abrasion, and mechanical pleurodesis).