. Author manuscript; available in PMC: 2015 Mar 1.

Published in final edited form as: J Autism Dev Disord. 2014 Mar;44(3):546–563. doi: 10.1007/s10803-013-1903-y

Table 3. Autism Severity Trajectory Classes.

	n (%)	Mean Posterior Probability	Intercept	Slope
Persistent High	47 (36.4%)	.90	9.18	−0.24
Persistent Moderate	54 (41.8%)	.78	7.12	−0.05
Worsening	10 (7.8%)	.77	4.42	0.58
Improving	18 (14.0%)	.73	6.43	−0.53

Note. Children were assigned to the class with the highest posterior probability. Mean Posterior Probability values are presented for classifying children into each of the four classes. Intercept is the mean calibrated severity score at Time 1 (age 2½).

Slope is the mean change in calibrated severity score per year.