TABLE III.

Adjusted Mortality Effect (Trauma Center vs. Nontrauma Center) by OTA Subclassification^*

Outcomes	Relative Risk (95% CI)
Hospital death
Pelvic A-Type	3.40 (1.23-9.39)
Pelvic B or C-Type	0.90 (0.22-3.67)
Acetabular A-Type	2.66 (0.32-22.15)
Acetabular B or C-Type	0.10 (0.02-0.47)
Death within 90 days
Pelvic A-Type	1.08 (0.51-2.30)
Pelvic B or C-Type	0.69 (0.23-2.06)
Acetabular A-Type	5.17 (0.72-37.02)
Acetabular B or C-Type	0.10 (0.02-0.47)
Death within 1 year
Pelvic A-Type	0.48 (0.26-0.91)
Pelvic B or C-Type	0.71 (0.24-0.91)
Acetabular A-Type	5.17 (0.72-37.02)
Acetabular B or C-Type	0.21 (0.06-0.76)

^*A-Type is stable with regard to pelvic ring disruption and involves a single column with regard to acetabular injury. B-Type is partially unstable with regard to pelvic ring disruption and includes a transverse component with regard to acetabular injury. C-Type is unstable with regard to pelvic ring disruption (complete disruption of the posterior arch) and involves complete articular injury of both columns with regard to the acetabulum. The weighted number of pelvic A-Type injuries was 1240; of pelvic B or C-Type, 941; of acetabular A-Type, 209; and of acetabular B or C-Type, 152. Thirty pelvic and eight acetabular injuries were not subclassified and were excluded from the stratified analysis.