Table 1.
Chronological and developmental ages by group
| Age | Early Onset (n = 17) |
Regression (n = 24) |
DD (n = 22) |
Typical (n = 22) |
F | Signif. |
|---|---|---|---|---|---|---|
| Chronological | ||||||
| Mean | 39.15 | 46.95 | 44.36 | 23.36 | 30.60 | p < .001 |
| SD | 10.29 | 9.34 | 8.86 | 7.80 | ||
| Range | 26–61 | 31–59 | 30–59 | 14–41 | ||
| Overall mental | ||||||
| Mean | 23.31 | 24.30 | 29.82 | 25.57 | 1.88 | p = .14 |
| SD | 9.94 | 8.86 | 10.39 | 9.12 | ||
| Range | 13–44 | 12–52 | 12–49 | 16–47 | ||
| Verbal mental | ||||||
| Mean | 19.82 | 20.19 | 27.55 | 25.73 | 3.12 | p < .05 |
| SD | 10.46 | 9.66 | 10.82 | 9.68 | ||
| Range | 5–44 | 8–47 | 9–50 | 15–49 | ||
| Nonverbal mental | ||||||
| Mean | 26.79 | 28.42 | 32.09 | 25.41 | 1.97 | p = .13 |
| SD | 10.40 | 8.50 | 10.61 | 8.80 | ||
| Range | 15–55 | 16–57 | 14–49 | 17–48 |
Note: DD, developmental delay.