Table 1.
Participant characteristics by group, final samples (M/SD)
| Measure | HR group N = 51 (29 girls) | LR group N = 16 (6 girls) | Pairwise comparison p-value |
|---|---|---|---|
| Age at 10 month assessment | 10.45/0.43 | 10.37/0.55 | > 0.25a |
| MSEL Early Learning Composite 10 months | 99.92/13.50 | 101.44/11.64 | > 0.25a |
| Age at 18 month assessment | 18.51/0.76 | 18.51/0.94 | > 0.25a |
| MSEL Early Learning Composite 18 months | 97.29/15.67 | 97.75/13.54 | > 0.25a |
| SESb | - 0.02/0.84 | 0.08/084 | > 0.25a |
| ADOS-T Total CSS 18 months | 3.18/1.74 | 2.06/1.53 | 0.009c |
| ADOS-T SA CSS | 3.24/1.91 | 1.94/1.73 | 0.004c |
| ADOS-T RRB CSS | 3.98/2.09 | 3.31/2.12 | 0.204c |
| ADOS-T Showing 18 months | 0.92/0.91 | 0.44/0.81 | 0.03c |
| ADOS-T Pointing 18 months | 0.71/0.81 | 0.38/0.50 | 0.157c |
aIndependent samples t-test
bSocioeconomic status calculated on the basis of parental education and income (equal weighting), expressed as a z-score (for this measure, N = 50 in the HR group and 15 in the LR group since two families did not disclose this information)
cMann-Whitney U Test