Table 1.
Participant characteristics
| Visit | Measure | LR | HR‐noASD | HR‐ASD | |||
|---|---|---|---|---|---|---|---|
| Mean (SD) | N | Mean (SD) | N | Mean (SD) | N | ||
| 4–6 months | Age at visit (months) | 5.1 (0.9) | 16 | 4.9 (0.9) | 15 | 4.9 (1.0) 5 | 5 |
| Mullen ELC SS | 99.44 (8.5) | 16 | 101.4 (12.7) | 15 | 104.75 (3.9) 4 | 4 | |
| 36 months | Age at visit (months) | 38.9 (1.5) | 15 | 38.6 (1.7) | 15 | 38.2 (0.5) 5 | 5 |
| Mullen ELC SS | 122.47 (10.4) | 15 | 112.53 (13.2) | 15 | 89.4 (26.5) 5 | 5 | |
| ADOS‐2 Total CSS | 1.60 (1.35) | 15 | 2.0 (1.56) | 15 | 3.80 (3.27) 5 | 5 | |
| ADOS‐2 SA CSS | 2.33 (1.76) | 15 | 2.0 (1.56) | 15 | 4.20 (3.11) 5 | 5 | |
| ADOS‐2 RRB CSS | 3.27 (2.22) | 15 | 2.67 (1.84) | 15 | 6.00 (1.41) 5 | 5 | |
| ADI – R Social | 0.87 (1.2) | 15 | 1.8 (2.6) | 15 | 10.4 (5.4) 5 | 5 | |
| ADI – R Comm | 0.40 (0.9) | 15 | 2.27 (3.8) | 15 | 13.5 (7.1) 5 | 5 | |
| ADI – R BRI | 0.07 (0.3) | 15 | 0.2 (0.56) | 15 | 4.80 (2.8) 5 | 5 | |
| SRS Total | 21.57 (12.2) | 14 | 21.07 (11.3) | 15 | 77.8 (42.8) 5 | 5 | |
| Sex (female/male) | 6/10 | 8/7 | 2/3 | ||||
Mullen ELC SS, Mullen Early Learning Composite Standard Score; ADOS‐2, Autism Diagnostic Observation Scale, 2nd edition; CSS, Calibrated Severity Score; SA, Social Affect; RRB, Restricted and Repetitive Behaviours; ADI‐R, Autism Diagnostic Interview‐Revised; Comm, Communication; BRI, Behaviours and Repetitive Interests; SRS, Social Responsiveness Scale.