Table 3. Odds Ratios Comparing 30- and 365-Day Mortality by Trauma Center Level Stratified by Injury Type.

Injury type and trauma center level	Odds ratio (95% CI)
	30 Days	365 Days
Cervical spine fracture
Level I	0.94 (0.65-1.35)	0.86 (0.63-1.18)
Level II	0.97 (0.68-1.38)	0.92 (0.68-1.25)
Level III	1.07 (0.75-1.53)	1.14 (0.84-1.55)
Level IV/NTC	1 [Reference]	1 [Reference]
Hip fracture and TBI
Level I	1.05 (0.74-1.50)	0.82 (0.60-1.13)
Level II	1.32 (0.94-1.86)	0.94 (0.70-1.27)
Level III	1.34 (0.94-1.89)	0.98 (0.72-1.32)
Level IV/NTC	1 [Reference]	1 [Reference]
Isolated hip fracture
Level I	1.03 (0.95-1.11)	0.96 (0.91-1.02)
Level II	1.07 (0.99-1.15)	1.00 (0.95-1.06)
Level III	1.14 (1.06-1.23)	1.07 (1.01-1.13)
Level IV/NTC	1 [Reference]	1 [Reference]
Isolated rib fracture
Level I	0.87 (0.67-1.14)	0.94 (0.79-1.14)
Level II	0.97 (0.75-1.25)	0.99 (0.83-1.18)
Level III	0.87 (0.68-1.13)	0.96 (0.81-1.14)
Level IV/NTC	1 [Reference]	1 [Reference]
Isolated TBI
Level I	1.29 (1.12-1.47)	1.11 (0.98-1.26)
Level II	1.56 (1.01-1.32)	1.12 (1.00-1.27)
Level III	1.28 (1.12-1.47)	1.27 (1.12-1.43)
Level IV/NTC	1 [Reference]	1 [Reference]
Other extremity fracturea
Level I	0.86 (0.73-1.01)	0.93 (0.84-1.03)
Level II	0.98 (0.83-1.14)	0.98 (0.89-1.08)
Level III	1.09 (0.93-1.27)	1.02 (0.93-1.12)
Level IV/NTC	1 [Reference]	1 [Reference]
Other injuryb
Level I	1.04 (0.87-1.24)	0.91 (0.81-1.01)
Level II	1.17 (0.98-1.39)	1.01 (0.91-1.12)
Level III	1.17 (0.98-1.38)	1.05 (0.95-1.16)
Level IV/NTC	1 [Reference]	1 [Reference]
Multiple traumas
Level I	1.41 (1.19-1.67)	1.09 (0.95-1.25)
Level II	1.18 (0.99-1.40)	0.96 (0.84-1.09)
Level III	1.10 (0.93-1.31)	1.01 (0.89-1.15)
Level IV/NTC	1 [Reference]	1 [Reference]

Abbreviations: NTC, non-trauma center; TBI, traumatic brain injury.

^a Other extremity fracture includes isolated fractures of the arm or leg other than hip fractures.

^b Other injury includes any National Trauma Data Bank eligible injury diagnosis not otherwise categorized.