Table 4.

Frequency of posterior symptoms and pairwise comparison in each group.

Patient group	tAD	PCA1	PCA2	Pairwise comparison
				PCA2 vs PCA1	PCA2 vs tAD
N	18	16	5	pa	pa
Ocular apraxia	1 (5%)	5 (31%)	0	0.21	0.78
Optic ataxia	0	1 (6%)	0	0.76	–
Simultanagnosia	1 (5%)	8 (50%)	0	0.06	0.78
Acalculia	5 (27%)	11 (68%)	3 (60%)	0.55	0.26
Agraphia	2 (11%)	12 (75%)	1 (20%)	0.04	0.57
Left-Right disorientation	3 (16%)	8 (50%)	2 (40%)	0.55	0.49
Finger agnosia	0	3 (18%)	1 (20%)	0.71	0.21
Alexia	3 (16%)	9 (56%)	2 (40%)	0.45	0.33
Spatial disorientation	7 (38%)	13 (81%)	1 (20%)	0.02	0.41
Dressing apraxia	5 (27%)	9 (56%)	2 (40%)	0.45	0.49
Constructive apraxia	12 (66%)	14 (87%)	3 (60%)	0.22	0.58
Visual agnosia	1 (5%)	6 (33%)	0	0.14	0.78

Patients with PCA2 show the second highest percentage (after PCA1) of individuals showing acalculia, alexia, dressing apraxia and visuospatial difficulties at the assessment time. However, they do not show any of the components of Balint's syndrome or visual agnosia.

^aFisher exact test.