Table 4.
Demographic information about the Down syndrome (DS) and typically developing (TD) control groups.
| DS (n = 85) | TD (n = 43) | ||||||
|---|---|---|---|---|---|---|---|
| M | SD | Range | M | SD | Range | X2 or T-stat | |
| Chron. Age | 12.3 | 5.03 | 4–24 | 12.35 | 5.41 | 4–22 | t(126) < 1, p > 0.95 |
| Nonverbal IQ∧ | 52.53 | 14.72 | 24–112 | 106.4 | 12.22 | 67–131 | t(124) = 20.59, p < 0.001 |
| Maternal Ed. | 15.69 | 2.34 | 6–21+ | 16.02 | 2.10 | 13–21+ | t(186) < 1, p > 0.43 |
| n | % | n | % | ||||
| Sex—male | 48 | 57 | 20 | 47 | X2 < 1.2, p > 0.28 | ||
| Race/Ethnicity—WNH* | 52 | 63 | 28 | 65 | X2 < 1, p > 0.85 | ||
∧DS group n = 83, missing data on 2 participants.
*
DS group n = 82, missing complete race and ethnicity information on 3 participants.
Chron. Age, Chronological Age; Maternal Ed = Year of Maternal Education; WNH, White Non-hispanic.