Table 4 Best fitting growth curve models for autism symptom measures
From: Autism through midlife: trajectories of symptoms, behavioral functioning, and health
|  | 4A. ADI-R Social Reciprocity Impairment | 4B. ADI-R Communication (non-Verbal) Impairment | 4C. ADI-R Communication (Verbal) Impairment (n = 318) | 4D. ADI-R Repetitive Behavior |
|---|---|---|---|---|
Best fitting Model | Model 3 | Model 1 | Model 3 | Model 4 |
Fixed Effects | ||||
 T1 age | .11 (.04)** | .04 (.01)** | .11 (.03)*** | .08 (.02)*** |
 Sex (Female = 1) | -.36 (.55) | -.32 (.23) | -.13 (.40) | -.02 (.23) |
 ID (ID = 1) | 3.42 (.70)*** | 1.14 (.22)*** | 2.20 (.53)*** | .01 (.42) |
 Age | -.17 (.04)*** | -.001 (.010) | -.15 (.03)*** | -.27 (.05)*** |
 Age-squared | – | – | – | .004 (.001)** |
 Age x ID | .18 (.04)*** | – | .09 (.03)** | .17 (.05)** |
 Age-sq x ID | – | – | – | -.004 (.001)*** |
 Constant | 12.5 (.60)*** | 3.78 (.21)*** | 8.51 (.41)*** | 5.81 (.34)*** |
Random Effectsa | ||||
 Var. (Age) | .037 [.020, .067] | – | .016 [.007, .036] | .003 [.001, .015] |
 Var. (intercept) | 20.6 [15.8, 27.1] | 3.48 [2.98, 4.08] | 9.09 [6.50, 12.7] | 3.98 [2.85, 5.57] |
 Cov. (Age, intercept) | -.280 [-.576, .015] | – | -.154 [-.324, .016] | -.053 [-.129, .023] |
 Var. (Level-1 residual) | 7.39 [6.78, 8.05] | 1.73 [1.60, 1.87] | 4.22 [3.82, 4.67] | 2.70 [2.48, 2.93] |