Table 5.
Toddler autism spectrum disorder subgroup differences on stereotyped interests and behavior (SIB) items found on diagnostic instruments
| Cluster 1 (n = 47) M (SD) |
Cluster 2 (n = 44) M (SD) |
Cluster 3 (n = 95) M (SD) |
F | p | η2 | |
|---|---|---|---|---|---|---|
|
|
||||||
| SIB items on the ADI-R | ||||||
| Unusual preoccupations | .64 (.87)a | .95 (.95)a | .98 (1.52)a | .69 | .50 | .01 |
| Verbal rituals | .46 (.98)a | .13 (.50)a | .08 (.50)a | 2.30 | .11 | .06 |
| Compulsions/rituals | .54 (.88)a | .09 (.29)a | .49 (1.38)a | 1.27 | .29 | .03 |
| Hand and finger mannerisms | .71 (.85)a | .96 (1.02)a | 1.24 (.93)a | 3.00 | .06 | .06 |
| Other complex mannerisms | 1.16 (1.28)a | .83 (.94)a | 1.07 (1.24)a | .57 | .57 | .01 |
| Repetitive use of objects | .65 (.89)a | .96 (.88)a | 1.72 (1.94)b | 4.74 | .01 | .09 |
| Unusual sensory interests | .62 (.70)a | .96 (.71)a | 1.23 (.70)b | 6.60 | <.01 | .13 |
| SIB items on the ADOS | ||||||
| Unusual sensory interests | .55 (.69)a | .72 (.82)a | 1.24 (.80)b | 10.8 | <.01 | .14 |
| Hand, finger, or other complex mannerisms | .66 (.82)a | .58 (.69)a | .89 (.87)a | 1.89 | .16 | .03 |
| Repetitive interests or stereotyped behaviors | .66 (.67)a | .67 (.83)a | 1.37 (1.01)b | 10.9 | <.01 | .14 |
Group differences are indicated by subscripts and reflect a Bonferroni adjustment for multiple comparisons