Table 1. Demographic comparison of study groups.

Characteristic	Room air group (n=47)	O2 group (n=128)	P value
Age, year	19.19±4.24	19.26±4.93	0.740
Male sex, n (%)	41 (87.2)	118 (92.2)	0.375
Right side, n (%)	17 (36.2)	42 (32.8)	0.720
Interval between radiographs (days)	4.23±2.66	2.56±1.15	<0.001
Initial pneumothorax size (%)	20.26±6.78	23.32±7.00	0.011
Last pneumothorax size (%)	12.11±4.94	12.98±5.27	0.250
Resolution rate (%/day)	2.06±0.97	4.27±1.97	<0.001