Table 1.

Demographic Characteristics by dementia status for individuals with Down syndrome

Characteristic	Demented	Non-demented	Total²
Sample Size (n)	53	155	208
Age at baseline (mean ± S.D.)**	55.1 ± 6.1	50.5 ± 5.3	51.7 ± 5.9
Sex (n,%)**
Male	18 (34.0)	29 (18.7)	47 (22.6)
Female	35 (66.0)	126 (81.3)	161 (77.4)
Level of Function (n,%)
Mild/Moderate	26 (49.1)	81 (52.3)	107 (51.4)
Severe/Profound	27 (50.9)	74 (47.7)	101 (48.6)
APOE ε4 Allele (n,%)*
No APOE ε4 Allele	38 (71.7)	124 (81.0)	162 (78.6)
One or more APOE ε4 Allele	15 (28.3)	29 (19.0)	44 (21.4)

^**p < 0.05

^*Number is less than 208 because of missing data