TABLE 3. Mean Duration, Peak Acceleration, and Mean Acceleration by Developmental Group (
, 
: Typical Development, 
: At Risk of Developmental Delay With Good/Poor Outcome).
| Outcome a | Developmental Group | Group Effect | Age Effect | Group  Age Interaction |
||
|---|---|---|---|---|---|---|
 |
 |
 |
||||
| Mean Outcome | ||||||
| Duration | 5.49 (0.05) b | 5.27 (0.06) | 5.22 (0.06) c | 0.008 | 0.69 | 0.005 |
| Peak Acceleration | 13.50 (0.17) | 13.22 (0.19) | 12.78 (0.20) c | 0.03 | <0.001 | NS |
| Mean Acceleration | 10.56 (0.05) | 10.58 (0.06) | 10.39 (0.06) bc | 0.04 | <0.001 | NS |
| Mean Rate of Change d | ||||||
| Duration | 0.01 (0.02) | −0.05 (0.02) | 0.03 (0.01) | - | - | - |
a
Data represent least squares means and standard error in the format of [LS-means (SE)].
b
Significantly different from 
group at Tukey-adjusted 
.
c
Data represent mean rate of change (SE) for every one month (30 day) increase in infant age.
d
Significantly different from TD group at Tukey-adjusted 
.