Table 3. The relationship between different needle size, pleural passes and pneumothorax.

Pleural passes	Pneumothorax	16 G, n (%)	17 G, n (%)	18 G, n (%)	19 G, n (%)	P value
1	No	137 (86.7)	217 (91.2)	54 (75.0)	21 (91.3)	0.004
	Yes	21 (13.3)	21 (8.8)	18 (25.0)	2 (8.7)
2	No	9 (81.8)	–	67 (89.3)	–	0.493
	Yes	2 (18.2)	–	8 (10.7)	–
3	No	5 (83.3)	3 (60.0)	–	3 (60.0)	0.604
	Yes	1 (16.7)	2 (40.0)	–	2 (40.0)
Total	No	151 (86.3)	220 (90.5)	121 (82.3)	24 (85.7)	0.129
	Yes	24 (13.7)	23 (9.5)	26 (17.7)	4 (14.3)