. Author manuscript; available in PMC: 2016 Jun 8.

Published in final edited form as: Am J Med Genet C Semin Med Genet. 2015 May 10;169(2):198–208. doi: 10.1002/ajmg.c.31440

Table III.

Changes in ASD Core Features from Age 2 to 19 by Outcome Group

Predictors	ADI-R Social Communication	ADI-R RSM	ADI-R IS
Predictors	Coefficient (S.E.)	Coefficient (S.E.)	Coefficient (S.E.)
Fixed Effects
Intercept	15.48 (1.86) ***	3.20 (.75) ***	1.28 (.51) ^*
Age at Testing	−.19 (.04) ***	−.01 (.0) ^**	−.00 (.00)
Group:
Very Positive (VPO)¹	------	------	------
VIQ ≥ 70 ASD	2.34 (2.17)	.87 (.87)	.79 (.59)
VIQ ≤ 70 ASD	7.90 (2.00) ***	1.99 (.80)***	.35 (.55)
Linear Slopes:
Age^* VPO	------	------	------
Age^* VIQ ≥ 70 ASD	.10 (.05) ^*	.00 (.00)	.00 (.00)
Age^* VIQ ≤ 70 ASD	.13 (.05)^**	.01 (.01)⁺	.01 (.003)^**
Quadratic Slopes:³
Age²	.06 (.01)^**	------²	------²
Age² ^* VPO	------	------	------
Age² ^* VIQ ≥ 70 ASD	.01 (.02)	------	------
Age² ^* VIQ ≤ 70 ASD	−.04 (.02)^*	------	------
	Variance	Variance	Variance

Random Effects
Intercept	13.04***	3.07***	1.31***
Slope	.0002	.0001^*	.0002***

N=85

^**

p<.01,

p<.05,

⁺

p < .10

^1.

Dashes indicate reference group.

^2.

Dashes indicate parameter was omitted from final model.

^3.

Quadratic slope parameters are multiplied by 100.