Table 2

 Perceptuospatial function

Perceptuospatial performanceMedian scoreRangep Value
FTDADFTDAD
Bold type indicates that the item significantly changed the odds of one or other diagnosis: *FTD performance worse than AD; †AD worse than FTD.
Analyses were based on a minimum of 73 Alzheimer patients and 33 FTD patients, except for the VOSP subtests, for which data were absent for larger numbers of patients owing to time constraints at the time of test administration (screening test: FTD 20, AD 63; incomplete letters: FTD 23; AD 68; silhouettes: FTD 20, AD 69; object decision: FTD 19, AD 60; dot counting: FTD 26, AD 72; position discrimination: FTD 14, AD 26; number location: FTD 18; AD 48; cube analysis: FTD 20, AD 48).
AD, Alzheimer’s disease; FTD, frontotemporal dementia.
No of correct answers
Line drawing identification (/10)10105 to 109 to 100.075
Celebrity identification (/9)991 to 92 to 90.242
Shape detection screening test (/20) 20 19 13 to 20 0 to 20 0.180
Incomplete letters (/20) 19 15 13 to 20 0 to 20 0.003
Silhouettes (/30)16145 to 232 to 260.884
Object decision (/20)16158 to 207 to 200.178
Dot counting (/10)1091 to 100 to 100.310
Position discrimination (/20) 20 18 11 to 20 0 to 20 0.033
Number location (/10)870 to 100 to 100.372
Cube analysis (/10) 9 6 1 to 10 0 to 10 0.021
Visual construction (/4) 2 1 0 to 4 0 to 4 0.002
Error types Per cent of subjects
Spatial errors in drawing 0 66% 0.000
Perseverative strokes in drawing 19% 4% 0.019*
Omission of detail in drawing76%77%0.904
Poor organisation of drawing 51% 23% 0.008*
Overelaboration in drawing 11% 0 0.099