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.