Posterior pelvic ring involvement detected with CT taken within a week of admission in acute fragility fractures of the pelvis (FFP) does not predict failure of conservative treatment: a retrospective cohort study

Table 8 Comparison of outcome between subgroup FFP II and subgroup FFP III/IV

	FFP II	FFP III/IV	P value (chi-square test)
LOS (mean)	24.37	27.86	0.571
Need for secondary surgery	5/116	1/7	0.234
Complications during hospitalisation	29/104	2/5	0.557
Mortality rate at 1 year	16/116	2/7	0.283
Mortality rate during admission	4/116	2/7	0.003
Secondary displacement	29/105	4/7	0.097
Readmission within 30 days	2/116	0/7	0.726

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