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Table 6 Associated injuries among adult bicycle traffic accident trauma patients

From: The protective effect of helmet use in motorcycle and bicycle accidents: a propensity score–matched study based on a trauma registry system

   Original cohort    Propensity score-matched cohort  
Associated injuries Helmet use
Yes n = 76
Helmet use
No n = 647
Odds ratio
(95%)
P Helmet use
Yes n = 76
Helmet use
No n = 76
Odds ratio
(95%)
P
Head trauma, n (%)
 Neurologic deficit 0(0.0) 3(0.5) 1.000 0(0.0) 0(0.0)
 Cranial fracture 4(5.3) 37(5.7) 0.9(0.32–2.64) 1.000 4(5.3) 5(6.6) 0.8(0.20–3.06) 1.000
 Epidural hematoma (EDH) 1(1.3) 34(5.3) 0.2(0.03–1.78) 0.163 1(1.3) 5(6.6) 0.2(0.02–1.66) 0.209
 Subdural hematoma (SDH) 2(2.6) 95(14.7) 0.2(0.04–0.65) 0.004 2(2.6) 10(13.2) 0.2(0.04–0.84) 0.031
 Subarachnoid hemorrhage (SAH) 8(10.5) 80(12.4) 0.8(0.39–1.80) 0.643 8(10.5) 9(11.8) 0.9(0.32–2.41) 0.797
 Intracerebral hemorrhage (ICH) 1(1.3) 16(2.5) 0.5(0.07–4.02) 1.000 1(1.3) 0(0.0) 1.000
 Cerebral contusion 3(3.9) 45(7.0) 0.6(0.17–1.81) 0.319 3(3.9) 4(5.3) 0.7(0.16–3.42) 1.000
 Cervical vertebra fracture 2(2.6) 9(1.4) 1.9(0.41–9.04) 0.325 2(2.6) 1(1.3) 2.0(0.18–22.84) 1.000
Maxillofacial trauma, n (%)
 Nasal fracture 1(1.3) 5(0.8) 1.7(0.20–14.85) 0.488 1(1.3) 2(2.6) 0.5(0.04–5.56) 1.000
 Maxillary fracture 9(11.8) 34(5.3) 2.4(1.11–5.27) 0.035 9(11.8) 4(5.3) 2.4(0.71–8.22) 0.147
 Mandibular fracture 2(2.6) 9(1.4) 1.9(0.41–9.04) 0.325 2(2.6) 0(0.0) 0.497