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Table 1 Different factors previously reported as risk factors for developing heterotopic ossification (HO)

From: Incidence and clinical relevance of heterotopic ossification after internal fixation of acetabular fractures: retrospective cohort and case control study

  HO ( n = 16) No HO ( n = 74) p value 95% CI
Traumatic brain injury 4 (25%) 3 (4%) p = 0.014*  
Spine injury 5 (31%) 15 (20.3%) p = 0.337  
Male–female ratio 10:6 (69%♂; 31%♀) 56:18 (76%♂; 24%♀) p = 0.351  
Interval injury to treatment (days mean ± SD) 9.188 ± 4.35 7.095 ± 4.33 p = 0.074; EE = −2 −4 to 0
Age (years mean ± SD) 39.875 ± 17.32 34.473 ± 13.30 p = 0.281; EE = −2 −13 to 4
  1. EE effect estimate.
  2. *Statistically significant; ♀ female; ♂male; Fisher exact test (two-sided).