Table 4.

Crude and adjusted odds ratio (OR) of surgical treatment. The crude as well as the adjusted odds ratio is shown for the categorical values used in the analysis.

Factor	Crude		Adjusted
	OR (95% CI)	P	OR (95% CI)	P
Fracture type
Anterior column	Ref.		Ref.
Posterior wall	2.96 (2.34–3.75)	<0.001	2.09 (1.57–2.80)	<0.001
Posterior column	1.93 (1.36–2.75)	<0.001	1.61 (1.06–2.45)	0.026
Anterior wall	0.15 (0.10–0.22)	<0.001	0.24 (0.16–0.36)	<0.001
Both column	7.84 (6.11–10.13)	<0.001	2.66 (1.99–3.57)	<0.001
Transverse	1.40 (1.05–1.85)	0.015	1.14 (0.82–1.60)	0.428
Posterior column + posterior wall	12.50 (6.75–25.31)	<0.001	5.58 (2.87–11.80)	<0.001
Transverse + posterior wall	8.31 (5.57–12.70)	<0.001	3.70 (2.42–6.07)	<0.001
T-shaped	3.12 (2.27–4.33)	<0.001	1.79 (1.23–2.62)	0.003
Anterior column + posterior hemi transverse	4.09 (3.27–5.12)	<0.001	1.92 (1.48–2.50)	<0.001
Roof-arc angle
AP < 40°	Ref.		Ref.
AP > 40°	0.41 (0.36–0.47)	<0.001	0.63 (0.52–0.75)	<0.001
Fracture step
>1 mm	Ref.		Ref.
<1 mm	0.15 (0.13–0.17)	<0.001	0.55 (0.45–0.67)	<0.001
Fracture gap
>3 mm	Ref.		Ref.
2–3 mm	0.18 (0.15–0.21)	<0.001	0.31 (0.25–0.38)	<0.001
0–1 mm	0.05 (0.04–0.06)	<0.001	0.12 (0.09–0.15)	<0.001
Comminution zone
No	Ref.		Ref.
<51%	4.38 (3.76–5.11)	<0.001	1.45 (1.18–1.77)	<0.001
>50%	7.47 (5.55–10.20)	<0.001	1.81 (1.29–2.59)	0.001
Injury extend
Isolated pelvic fracture	Ref.		Ref.
Multiple trauma	1.11 (0.95–1.30	0.166	1.14 (0.92–1.42)	0.233
Polytrauma	0.88 (0.75–1.02)	0.089	1.06 (0.76–1.47)	0.742
Complex fracture
No	Ref.		Ref.
Yes	1.19 (0.89–1.62)	0.228	1.30 (0.87–1.98)	0.207
Gender
Male	Ref.		Ref.
Female	0.54 (0.47–0.62)	<0.001	0.79 (0.66–0.95)	0.013
Patient admission
Primary	Ref.		Ref.
Secondary	3.26 (2.85–3.75)	<0.001	1.90 (1.60–2.26)	<0.001