TABLE 2.
Median and Interquartile Range Scores for the GP-AD and DS-AD Groups on the SIB
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| GP-AD | DS-AD | |||||
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| SIB Domain | Label | Median | IQR | Median | IQR | Max. |
| Social Interaction | SIB-SI | 6.0 | 6.0 – 6.0 | 6.0 | 6.0 – 6.0 | 6.0 |
| Memory | SIB-M | 8.0 | 6.5 – 11.0 | 9.0 | 7.0 – 11.0 | 14.0 |
| Orientation | SIB-O | 3.0 | 2.0 – 4.0 | 3.0 | 2.0 – 5.0 | 6.0 |
| Orientation to Name | SIB-ON | 2.0 | 2.0 – 2.0 | 2.0 | 2.0 – 2.0 | 2.0 |
| Attention | SIB-A | 4.0 | 2.0 – 5.0 | 4.0 | 2.0 – 5.0 | 6.0 |
| Praxis | SIB-PR | 4.5 | 3.0 – 7.5 | 8.0 | 4.0 – 8.0 | 8.0 |
| Language | SIB-L | 36.0 | 32.5 – 38.5 | 36.0 | 26.0 – 40.0 | 46.0 |
| Visuospatial | SIB-VS | 6.5 | 5.5 – 8.0 | 7.0 | 5.0 – 8.0 | 8.0 |
| Construction | SIB-C | 4.0 | 3.0 – 4.0 | 4.0 | 2.0 – 4.0 | 4.0 |
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| Total Score | SIB-TS | 71.00 | 65.0 – 82.5 | 76.00 | 57.0 – 88.0 | 100.0 |
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| Language Components | ||||||
| Read/Write | 7.0 | 6.0 – 8.0 | 4.0 | 2.0 – 7.0 | 8.0 | |
| Comprehension | 6.0 | 5.0– 6.0 | 6.0 | 5.0 – 6.0 | 6.0 | |
| Fluency | 3.0 | 2.0 – 3.0 | 3.0 | 2.0 – 4.0 | 4.0 | |
| Naming | 22.0 | 18.0 – 24.0 | 22.0 | 18.0 – 25.0 | 28.0 | |
Abbreviations: GP-AD, individuals from the general population with Alzheimer’s disease; DS-AD, persons with Down syndrome and Alzheimer’s disease; IQR, interquartile range; SIB, Severe Impairment Battery.