Table 2.
Fixed effects and standard errors of group membership and ASD symptoms on attention parameters
| Group comparisons | R 2 | Intercept | Age | Group | Group × age | % inattention | % inattention × Age |
| Proportion time inattentive | .19 | 0.32 (0.03)** | 0.02 (0.01)* | 0.03 (0.05) | − 0.04 (0.01)** | – | – |
| Proportion time in HRDSA | .54 | 0.29 (0.02)** | − 0.02 (0.01)* | − 0.04 (0.03) | 0.02 (0.01)* | − 0.64 (0.08)** | 0.02 (0.03) |
| IBI change during HRDSA | − .06 | 3.39 (0.14)** | 0.04 (0.05) | − 0.17 (0.19) | − 0.02 (0.08) | − 0.60 (0.57) | − 0.16 (0.22) |
| Autism symptom severity (HFR infants only) | R 2 | Intercept | Age | Autism | Autism × age | % inattention | % inattention × Age |
| Proportion time Inattentive | − .01 | 0.48 (0.10)** | − 0.004 (0.03) | − 0.07 (0.06) | − 0.01 (0.02) | – | – |
| Proportion time in HRDSA | .67 | 0.30 (0.06)** | 0.02 (0.02) | − 0.03 (0.04) | − 0.02 (0.01) | − 0.81 (0.12)** | − 0.04 (0.05) |
| IBI change during HRDSA | .39 | 3.51 (0.35)** | 0.24 (0.07)** | − 0.18 (0.22) | − 0.19 (0.05)** | − 0.56 (0.64) | − 0.52 (0.26)* |
*p < .05, **p < .01
HRDSA heart rate-defined sustained attention, IBI interbeat interval