Fig. 1

ICD-10 categories of comorbid conditions in younger and older males and females with TBI. Categories of comorbid conditions in younger [<65 years of age (yoa)] and older (≥65 yoa) males and females with TBI in inpatient rehabilitation in Ontario, Canada 2004/05–2007/08. For each patient, multiple comorbidities were included. Regardless of age, sex differences at the p < 0.001 after Bonferroni correction were observed in disorders of the Endocrine, Nutritional, Metabolic and Immune System, Circulatory System, Musculo-skeletal system, and the Symptoms, Signs, and Ill-defined conditions. In the younger age group, sex differences at the p < 0.001 after Bonferroni correction were observed in Symptoms, Signs, and Ill-defined conditions, and in the older age group, in disorders of the Musculo-skeletal system