Table 1.
Participant Characteristics
| Demographic Data | Percenta |
|---|---|
| Gender: Male | 82.8 |
| SESb | |
| Major Business/Professional | 38.0 |
| Medium Business/Minor Professional | 42.4 |
| Skilled Craftsman/Clerical/Sales | 13.0 |
| Machine Operator/Semi-skilled | 4.3 |
| Unskilled Laborers/Menial Service | 2.2 |
| Educational Statusc | |
| High School | 13.8 |
| Partial College/Specialized Training | 10.3 |
| College | 75.9 |
| Race | |
| Asian | 1.6 |
| Black/African-American | 2.5 |
| White | 95.9 |
| Ethnicity: Hispanic/Latino | 0.8 |
| Percent with Down syndrome | 23.8 |
| Adaptive Behavior Classificationd | |
| Moderately High (115–129) | 0.8 |
| Adequate (86–114) | 6.6 |
| Moderately Low (71–85) | 23.0 |
| Low (≤70) | 69.7 |
| Mild (55–70) | 45.9 |
| Moderate (40–54) | 15.6 |
| Severe (25–39) | 7.4 |
| Profound (≤24) | 0.8 |
| Cognitive Data | M | SD | Range |
| Full Scale IQ | |||
| WISC-IV (n = 48) | 98.02 | 19.83 | 44–131 |
| WAIS-III (n = 2) | 100.00 | ----- | 0 |
| Stanford-Binet-5 (n = 30) | 96.60 | 19.40 | 41–131 |
| Leiter-R (n = 32) | 53.31 | 26.15 | 36–125 |
Notes.
a
Percentages in some categories do not sum to 100 due to rounding error.
b
Hollingshead (1975) scale used for participants without Down Syndrome (n = 92).
c
Indicator of SES for families of participants with Down Syndrome (n = 29), Hollingshead data were not collected in that study.
d
Categories reported are based on Adaptive Behavior Composite standard score ranges consistent with Sparrow, Cicchetti, and Balla (2005). Categorical data presented because 93 participants were administered the Vineland Adaptive Behavior Scales (Sparrow, Balla, & Cicchetti, 1984) and 29 were administered the Vineland-II (Sparrow et al., 2005) in separate studies.