Table 4.
Characteristics of the sample as a function of onset classification method
| AUTISM | TD | ||||||
|---|---|---|---|---|---|---|---|
|
| |||||||
| Parent Report | TRAJ Grouping | ||||||
|
| |||||||
| PR_Early Onset (n = 18) | PR_Regression (n = 24) | PR_Plateau (n = 10) | TRAJ1/Early Onset (n = 20) | TRAJ2/Regression (n = 20) | TRAJ3/Plateau (n = 12) | (n = 23) | |
| Gender | |||||||
| Female | 0 (0%) | 5 (21%) | 1 (10%) | 1 (5%) | 4 (20%) | 1 (8%) | 11 (48%) |
| Male | 18 (100%) | 19 (79%) | 9 (90%) | 19 (95%) | 16 (80%) | 11 (92%) | 12 (52%) |
| Race/Ethnicity a | |||||||
| Caucasian, non-Hispanic | 11 (69%) | 15 (62.5%) | 9 (90%) | 13 (65%) | 12 (67%) | 12 (67%) | 18 (78%) |
| Other Race/Ethnicity | 5 (31%) | 9 (37.5%) | 1 (10%) | 7 (35%) | 6 (33%) | 6 (33%) | 5 (22%) |
| Age at visit (years) | 2.8 (0.8) | 3.7 (0.8) | 3.0 (0.6) | 3.5 (1.1) | 3.1 (0.7) | 3.1 (0.7) | 1.9 (0.7) |
| Mean Visual Reception T-Scoreb | 31.1 (16.5) | 27.1 (10.4)† | 33.7 (9.2)† | 27.9 (11.3) | 30.7 (15.1) | 31.9 (11.3) | 57.6 (9.8) |
| Mean Fine Motor T-Scoreb | 29.4 (9.7) | 27.8 (13.1)† | 38.4 (14.7)† | 28.8 (10.1) | 28.3 (9.2) | 37.7 (19.1) | 55.6 (7.8) |
| Mean Receptive Language T-Scoreb | 26.6 (12.5) | 22.9 (6.7) | 30.7 (14.0) | 23.3 (8.1) | 25.1 (10.8) | 31.5 (14.0) | 55.1 (11.6) |
| Mean Expressive Language T-Scoreb | 27.9 (13.2) | 23.1 (5.4) | 26.9 (13.9) | 22.9 (4.3) | 24.9 (10.0) | 31.5 (16.7) | 55.5 (11.7) |
| Mean Early Learning Compositec | 62.9 (19.7) | 56.2 (11.8) | 66.7 (20.3) | 56.8 (10.2) | 59.6 (16.2) | 68.0 (23.7) | 111.8 (15.4) |
| Mean ADOS Communication + Social Interaction Totalc | 15.0 (3.7)† | 16.8 (2.9) | 17.5 (4.6)† | 15.5 (3.0)† | 17.5 (4.1)† | 15.6 (3.7) | 2.6 (2.1) |
Note: Continuous variables are presented as mean (SD)
a, b, c
Data missing for 2, 8 and 4 participants, respectively
†
Autism subgroups with same superscript differ at p <.10 after Bonferroni correction
PR = parent report group; TRAJ = trajectory group; TD = typically developing group; ADOS = Autism Diagnostic Observation Schedule.