Table 1.
Participant demographics at ages 6 and 14 months.
| Measure | Group at age 6 months |
Group at age 14 months |
||||||
|---|---|---|---|---|---|---|---|---|
| LR | HR | LR | HR | |||||
| n = 43 | n = 66 | n = 33 | n = 53 | |||||
| lMale/female | 24/19 | 36/30 | 18/15 | 29/24 | ||||
| lHas (a) Sibling(s) | 26 | 66 | 20 | 53 | ||||
 |
SD | |
SD | |
SD | |
SD | |
| Age | 6.7 | 0.51 | 6.7 | 0.56 | 14.8 | 0.77 | 14.8 | 0.78 |
| AOSI Total | 5.4 | 3.0 | 7.5∗ | 3.5 | ||||
| MSEL Gross Motor | 6.5 | 1.0 | 6.3 | 1.4 | 15.7 | 2.2 | 14.9 | 1.8 |
| MSEL Fine Motor | 7.1 | 1.2 | 6.5∗ | 1.3 | 17.1 | 1.4 | 16.5 | 1.7 |
| MSEL Visual Reception | 7.0 | 1.0 | 6.7 | 0.97 | 17.2 | 1.8 | 15.6∗ | 1.9 |
| ADOS-T overall | 3.5 | 2.2 | 8.2∗ | 5.6 | ||||
| ADOS-T SA total | 2.2 | 2.0 | 6.3∗ | 4.8 | ||||
Out of 109 infants who completed the ball-rolling experiment at age 6 months, 21 did not complete a 14-month visit. Nine of the 21 attrited from the study and 12 missed their 14-month study visit. AOSI, Autism Observation Scale for Infants; ADOS-T, Autism Diagnostic Observation Schedule-Toddler Module; SA, Social Affect. ∗ indicates significant difference between LR and HR groups, p < 0.05.