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Computed trajectory slopes for derived groups (clusters) of autistic symptom severity across assessment intervals
| Trajectory group | Assessment intervals | Slope |
|---|---|---|
|
Group 1 (27% of sample): Continuously Improving Trajectory |
T1–T2 (41–56 months) | −0.559 |
| T2–T3 (56–80 months) | −0.235 | |
| T3–T4 (80–129 months) | −0.304 | |
|
Group 2 (73% of sample): Improving then Plateauing Trajectory |
T1–T2 (41–56 months) | −0.195 |
| T2–T3 (56–80 months) | −0.147 | |
| T3–T4 (80–129 months) | 0.026 |
