Table 1.

The thoracic trauma severity score

Grade	Sa)	Rib fractures	Contusion	Pleural involvement	Age (yr)	Points
0	400≤S	0	None	None	<30	0
I	300≤S<400	1–3	1 lobe, unilateral	PTX	30–41	1
II	200≤S<300	>4	Unilobar bilateral or bilobar unilateral	HTX/HPTX unilateral	42–54	2
II	150≤S<200	>3 bilateral	<2 lobes bilateral	HTX/HPTX bilateral	55–70	3
IV	S<150	Flail chest	≥2 lobes bilateral	TPTX	>70	5

For calculation of the total score, all categories are summed. The score can range from 0 to 25.

PTX, pneumothorax; HTX, hemothorax; HPTX, hemopneumothorax; TPTX, tension pneumothorax.

^a)S is PaO₂/FiO₂.