Table 1. Demographic and clinical variables of cohort.

		All Groups		Young (<55 years old)		Old (≥ 55 years old)
Demographic		Male (n = 29)	Female (n = 17)	Male (n = 25)	Female (n = 10)	Male (n = 4)	Female (n = 7)
	Age (years)	42.7±13.3	50.5±14.0	40.0±11.9	42.5±12.8	60.7±4.3	61.9±4.7
	Caucasian (%)	96.7	82.4	96	80	100	85.7
	BMI (kg/m2)	26.8±4.1	26.2±3.9	26.±4.4	28.1±4.2	27.8±2.2	23.6±1.1
Clinical factors (%)
	Hypertension	27 (8/29)	47 (8/17)	20(5/25)	50(5/10)	75(3/4)	43(3/7)
	Heart disease	0	0	0	0	0	0
	COPD/Asthma	20(6/29)	6(1/17)	24(6/25)	10(1/10)	0	0
	Autoimmune, inflammatory, or infectious disease	12(3/29)	0	8(2/25)	0	25(1/4)	0
	Kidney disease	0	6(1/17)	0	0	0	10(1/7)
	Steroid use	0	0	0	0	0	0
Cause of Death (%)
	Hemorrhage	23(7/29)	29(5/17)	24(6/25)	50(5/10)	25(1/4)	0
	Blunt injury	6(2/29)	12(2/17)	4(1/25)	10(1/10)	25(1/4)	14(1/7)
	SIGSW	6(2/29)	0	8(2/25)	0	0	0
	EtOH abuse	3(1/29)	0	4(1/25)	0	0	0
	Hepatorenal syndrome	3(1/29)	0	4(1/25)	0	0	0
	Shock secondary to burns	3(1/29)	0	4(1/25)	0	0	0
	Trauma	6(2/29)	6(1/17)	8(2/25)	10(1/10)	0	0
	Smoke inhalation-respiratory disease	3(1/29)	0	4(1/25)	0	0	0
	Hanging	12(3/29)	6(1/17)	8(2/25)	10(1/10)	25(1/4)	0
	Drug intoxication	12(3/29)	0	8(2/25)	0	25(1/4)	0
	Trauma	6(2/29)	6(1/17)	8(2/25)	10(1/10)	0	0
	Asphyxiation	6(2/29)	6(1/17)	8(2/25)	0	0	14(1/7)
	Seizure	3(1/29)	0	4(1/25)	0	0	0
	Drug overdose	0	18(3/17)	0	10(1/10)	0	29(2/7)
	Complications from ALS	0	6(1/17)	0	0	0	14(1/7)
	Liver transplant	0	6(1/17)	0	0	0	14(1/7)
	Not available	0	6(1/17)	0	0	0	14(1/7)

ALS, amyotrophic lateral sclerosis; MVA, motor vehicle accident; SAH, subarachnoid hemorrhage; SIGSW, survivors of self-inflicted gunshot wound.