Table 1. Characteristics of 5% sample of Medicare beneficiaries aged ≥65 hospitalized with traumatic brain injury in 2006-2009, n=16,936.

Characteristic
Mean age (years) (standard deviation)	81.0 (7.9)
Age group (years), n (%)
65-75	3,889 (23)
75-84	6,906 (41)
≥85	6,141 (36)
Sex, n (%)
Female	10,557 (62)
Male	6,379 (38)
Race, n (%)
White	15,175 (90)
Black	876 (5)
Other	885 (5)
Comorbid disease at TBI hospitalization, n (%)
Alzheimer's disease and related dementias	5,706 (34)
Heart failure	7,869 (46)
Chronic obstructive pulmonary disease	5,308 (31)
Diabetes	6,535 (39)
Atrial fibrillation	4,664 (28)
Rheumatoid arthritis	8,844 (52)
History of depression	6,877 (41)