Table 4:

Diagnostic yield of multidetector CT angiography in different age groups

	Group 1 (18–45 years)			Group 2 (46–70 years)			Group 3 (71–94 years)
	No.	% Positive CTAs*	P Value†	No.	% Positive CTAs*	P Value†	No.	% Positive CTAs	P Value†
All patients in group	87	47.1	n/a	263	14.8	n/a	273	4	n/a
Sex			<.01			.24			.06
Male	49	34.7		164	12.8		122	1.6
Female	38	63.2		99	18.2		151	6
Hemorrhage site			<.01			<.01‡			.24
Lobar	60	58.3		155	21.3		167	4.8
Deep gray matter	21	9.5		75	1.3		77	1.3
Infratentorial	6	66.7		33	15.2		29	6.9
Known HTN			<.01			<.01			0.09
Yes	23	4.3		158	9.5		187	2.7
No	64	62.5		105	22.9		86	7
IC			.13			.04			.03
Yes	6	16.7		77	7.8		121	0.8
No	81	49.4		186	17.7		152	6.6
Neither HTN nor IC			<.01			<.01			<.01
Yes	60	65		90	26.7		57	10.5
No§	27	7.4		173	8.7		216	2.3
IVH			.26			.21‡			.22
Yes	49	42.9		111	18		133	2.3
No	38	52.6		152	12.5		140	5.7

Note:—No. indicates the number of patients; IC, impaired coagulation.

^*Includes 1 false-positive CTA.

^†From univariate analysis with the Pearson χ² test.

^‡Independent predictor in multiple variable logistic regression analysis.

^§Includes patients with either HTN and/or impaired coagulation.