Table 1.

Operation related parameters of the two groups

Variables	Hook-wire(n = 256)	Four-hook (n = 436)	P
Subcutaneous hemorrhage Subcutaneous emphysema	74(28.9%) 58(22.7%)	88(20.2%) 107(24.5%)	0.009 0.574
Parenchymal hemorrhage	31(12.1%)	51(11.7%)	0.871
Pneumothorax Subcutaneous complications Intrathoracic complications Total complications localization operation time(min) Chest pain scores	49(19.1%) 111(43.4%) 75(29.3%) 152(59.4%) 10(8–14) 3(2–5)	56(12.8%) 171(39.2%) 106(24.3%) 232(53.2%) 9(7–11) 2(1–3)	0.026 0.285 0.150 0.115 0.001 0.001