Table 2. Clinical Variables by Age.

Anticoagulation χ2 =40.305 P < 0.001***	Aspirin	Warfarin	Aspirin + Clopidogrel	Aspirin + Warfarin	Aspirin + Clopid. + Warfarin	Other	None
Younger (< 65 years old)	N=1 (2%)	N=0 (0%)	N=1 (2%)	N=3 (7%)	N=0 (0%)	N=1 (2%)	N=38 (87%)
Older (> 65 years old)	N=14 (39%)	N=1 (3%)	N=6 (17%)	N=3 (8%)	N=2 (6%)	N=0 (0%)	N=10 (27%)

Medical Intervention	Fresh Frozen Plasma	Prothrombin Complex Concentrate	Vitamin K	Platelets
Younger (< 65 years old)	N=3 Yes N=41 No	N=1 Yes N=43 No	N=3 Yes N=41 No	N=4 Yes N=40 No
Older (> 65 years old)	N=4 Yes N=32 No	N=5 Yes N=31 No	N=5 Yes N=31 No	N=19 Yes N=17 No
	Fischer’s Exact Test:2-tail difference between groups p=0.69	Fischer’s Exact Test:2-tail difference between groups p<0.01*	Fischer’s Exact Test:2-tail difference between groups p=0.45	Fischer’s Exact Test:2-tail difference between groups p< 0.001***

Surgery Required Fischer’s Exact Test:2-tail difference between groups p=1	Yes	No
Younger (< 65 years old)	N=10	N=34
Older (> 65 years old)	N=9	N=27

Type of Surgery χ2 =4.226 p=0.238	Bur-Hole Drainage	Craniotomy	Twist-drill Craniostomy
Younger (< 65 years old)	N=1 (11%)	N=8 (89%)	N=0 (0%)
Older (> 65 years old)	N=0 (0%)	N=7 (78%)	N=2 (22%)