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Table 2 Factor scores derived by factor analysis to allocate the SIB items into new subscales

From: Rivastigmine in moderately severe-to-severe Alzheimer’s disease: Severe Impairment Battery factor analysis

SIB item Factor 1: visual Factor 2: language Factor 3: working memory/memory Factor 4: praxis and social skills Factor 5: naming
1a: Shake hands 0.18637 0.10742 0.14187 0.46777 0.06278
1b: Follow directions 0.03926 0.16075 0.09979 0.72810 −0.02260
1c: Sit/move to table/pull tray 0.14512 0.07164 0.03912 0.81773 0.09756
2: Examiner’s name (immediate recall) 0.19391 0.01890 0.35278 0.20451 0.00918
3: Subject’s name 0.13280 0.09591 0.11500 0.27894 0.13269
4a: Write name 0.14911 0.83191 0.21540 −0.01825 −0.13753
4b: Copy name 0.18811 0.79331 0.22121 0.02954 −0.17792
5: Current month 0.09048 0.10255 0.16135 −0.00452 0.08214
6: Months of the year −0.08840 0.44571 0.16330 0.06817 0.13195
7: City 0.03403 0.23398 0.47705 0.03550 0.13178
8a + 8b: Descriptive naming (cup + spoon) 0.19170 0.11481 0.45178 0.17732 0.53765
9a: Reading comprehension 0.04419 0.56384 0.01299 0.09907 0.24333
9b: Verbal comprehension 0.10071 0.58147 0.04924 0.17725 0.22978
9c: Reading 0.06602 0.75731 −0.03219 0.10638 0.12338
10: Sentence recall 0.12520 0.43543 0.27214 0.11551 0.15668
11a + 11b: Repetition (people spend money + baby) 0.17676 0.15277 0.29899 0.46208 0.21274
12: Digit span (series) −0.01152 0.12864 0.39120 0.09214 0.02801
13: Verbal fluency 0.22551 0.00574 0.60501 0.16787 0.25116
14: Examiner’s name (delayed recall) 0.02598 0.04244 0.22845 0.06847 −0.00027
15 + 20: Naming object in photograph (cup + spoon) 0.20978 0.21774 0.18377 0.15042 0.67844
16 + 18: Using cup (photograph + object) 0.24127 0.04208 0.48144 0.06123 0.41299
17 + 22: Naming object (cup + spoon) 0.19141 0.15694 0.16444 0.19876 0.70735
19 + 24: Forced choice naming (cup + spoon) 0.34707 0.04743 0.04278 0.33749 0.37978
21 + 23: Using spoon (photograph + object) 0.24747 0.06307 0.40561 0.15432 0.39211
25: Immediate recall of objects (cup + spoon) 0.30110 0.10494 0.46109 0.22645 0.17432
26 + 30a + 30b: Color naming (blue + red + green) 0.52207 0.21932 0.07852 0.03810 0.36658
27: Color matching 0.59979 0.05950 0.12284 0.12189 0.17387
28: Colored block 0.56639 0.10328 0.02037 0.12734 0.05381
29: Color discrimination 0.68207 0.13255 0.28264 0.15338 0.11077
31: Shape matching 0.54832 0.13483 0.23207 0.22148 0.32796
32: Shape 0.55816 −0.04496 0.22437 0.19948 0.09445
33: Shape discrimination 0.58847 0.06018 0.38125 0.26172 0.10459
30c + 34a + 34b: Shape identification (square + circle + triangle) 0.36032 0.26761 0.33625 0.21808 0.20124
35a: Drawing (circle) 0.23055 0.20295 0.28592 0.04922 0.25047
35b: Drawing (square) 0.23820 0.30433 0.47077 0.06087 0.13839
36: Auditory span 0.21216 0.12792 0.28611 0.27011 0.10342
37: Visual span 0.26459 0.28920 0.30645 0.17403 0.30167
38: Delayed recall of objects (cup + spoon) 0.37135 −0.04291 0.47166 0.16280 0.07484
39: Orientation to name 0.15592 0.01837 0.16938 0.58642 0.14839
40: Language ability (free conversation) 0.16147 −0.07097 0.40767 0.47483 0.16766
  1. SIB, Severe Impairment Battery. Scores were derived using initial common factor extraction and the principal component method, and were based on data from 217 patients. Estimates of loadings were obtained using varimax rotation. SIB items were allocated to factors on the basis of highest score. Items allocated to each factor are shown in bold.