Table 2

Varimax-rotated component matrix from principal component analysis

	Syndrome dimension 1	Syndrome dimension 2	Syndrome dimension 3	Syndrome dimension 4	Syndrome dimension 5	Syndrome dimension 6
Disinhibition	0.7399	0.0774	−0.0790	−0.1423	−0.1576	0.1102
Apathy	0.5486	0.0763	0.4276	0.1221	−0.1919	0.1450
Loss of sympathy or empathy	0.7022	0.1278	0.0044	−0.0981	−0.1278	0.0205
Stereotyped/compulsive behaviour	0.5789	0.2890	−0.3103	−0.1798	−0.0536	0.2444
Hyperorality/dietary change	0.6234	0.0459	−0.2198	−0.1270	−0.0932	0.0705
Executive dysfunction	0.5458	0.1440	0.1176	−0.0176	−0.0476	0.3155
CBIR—Abnormal behaviour	0.7497	0.1251	−0.0348	−0.0545	−0.0898	−0.3164
CBIR—Mood	0.5485	0.1013	0.0039	0.1709	−0.0077	−0.5067
CBIR—Eating habits	0.7647	0.0394	−0.0486	−0.0500	−0.0074	−0.2188
CBIR—Sleep	0.4569	−0.0259	0.2813	0.1776	−0.0488	−0.4043
CBIR—Motor behaviour	0.7056	−0.0161	−0.1997	−0.1174	0.0726	−0.2513
CBIR—Motivation	0.7075	0.2981	0.1511	0.0500	−0.1157	−0.1488
ACER—Attention/orientation	−0.1510	−0.9002	0.0922	0.0463	−0.0248	0.0724
ACER—Memory	−0.1124	−0.8258	0.3410	0.1746	−0.0440	0.0770
ACER—Fluency	−0.1784	−0.7576	0.1183	0.1772	−0.0744	−0.1227
ACER—Language	−0.0805	−0.8460	0.3405	0.1337	0.0314	0.0238
ACER—Visuospatial	−0.0532	−0.8299	−0.1642	−0.1818	−0.0460	0.1518
CBIR—Memory	0.4864	0.5544	−0.2152	−0.0392	0.0199	−0.3158
CBIR—Everyday skills	0.4086	0.5214	0.3309	0.3198	0.0727	−0.1291
Symmetrical parkinsonism	0.0127	−0.0415	0.7676	−0.3673	0.0655	−0.0362
Axial rigidity	−0.0156	−0.1158	0.8077	0.0425	−0.0231	0.0669
Poor levodopa responsiveness	−0.1307	−0.1057	0.6757	0.0873	−0.0629	−0.0536
Postural instability	−0.0504	−0.1069	0.7719	0.1690	−0.0640	−0.0241
Supranuclear gaze palsy	−0.0938	−0.1144	0.8132	0.1045	−0.0473	0.0526
CBIR—Self care	0.3459	0.3996	0.4524	0.3626	−0.0628	−0.0775
Impaired semantics	0.1510	0.3067	−0.5187	−0.2377	0.0353	0.1970
Asymmetrical parkinsonism	−0.0652	−0.0843	0.0700	0.8343	−0.0627	0.0202
Asymmetrical dystonia	0.0282	−0.0673	0.0899	0.8300	−0.0550	0.1061
Asymmetrical myoclonus	−0.0340	−0.0148	−0.0493	0.6830	0.1012	0.0621
Limb apraxia	−0.1292	−0.0590	0.1252	0.5274	0.5056	−0.0233
Cortical sensory loss	−0.1462	−0.0201	0.0584	0.5635	0.2569	−0.2505
Alien limb syndrome	−0.0363	−0.0066	0.0504	0.5423	0.0749	−0.1367
Symmetrical myoclonus	−0.0658	−0.0350	0.0044	−0.0093	0.5132	−0.3228
Agrammatic, apraxic speech	−0.1224	0.1231	−0.0369	0.1137	0.7667	0.2703
Logopenic speech	−0.0659	0.0268	−0.1180	−0.0461	0.7752	0.0415
CBIR—Beliefs	0.1830	0.2358	0.0220	−0.0019	0.0093	−0.5919
Symmetrical dystonia	0.1134	0.1176	0.3325	−0.1741	0.2010	0.0008
Orobuccal apraxia	−0.1225	−0.0170	−0.0012	0.2822	0.3727	−0.0267
Visuospatial deficits	−0.1863	0.1862	−0.0106	0.2386	0.3650	−0.2559
Motor neuron disease	0.2615	−0.1304	−0.1584	−0.0617	−0.1683	0.0556

Positive loadings indicate worse performance or presence of symptoms, except for ACER where negative loadings indicate worse performance. Factor loadings above 0.4 or below −0.4 shown in bold.
ACER, Addenbrooke’s Cognitive Examination - Revised; CBIR, Cambridge Behavioural Inventory - Revised.