Table 1

Trajectory Class Comparisons

Characteristics	High (n = 18)	Medium (n = 17)	Low (n = 51)	p
Special education (%)	89	41	22	p = .000^**
Cognitive impairment (%)	72	47	26	p = .002^**
Physical or sexual abuse (%)	89	65	65	p = .142
Sexual abuse (%)	78	47	51	p > .313
Physical abuse (%)	56	3	45	p > .313
Symptom onset (mean years)	12	16	22	p = .000^**
Placement outside house (%)	94	59	49	p = .003^**
BMI (mean)	36.8	40.2	31.9	p = .005^**
Hypothyroidism (%)	50	24	20	p = .043^*
Self-injury frequency (mean Likert score)	6.94	2.56	0.43	p = .000^**
Suicide attempt frequency (mean Likert score)	1.67	1.12	0.90	p = .090
Attempted elopement (%)	61	71	35	p = .019^*
Prior institutional aggression (mean Likert score)	4.56	3.47	1.90	p = .000^**
Aggression seriousness (mean Likert score)	2.50	1.29	0.37	p = .000^**
Attention deficit disorder (%)	44	0	6	p = .000^**
School behavior problems (%)	44	53	10	p = .000^**

N = 86;
↵* p < .05;
↵** p < .01.
Significant Kruskal-Wallis test results were followed up with planned and post hoc comparisons between trajectory classes. The results of these analyses are in the text.