Table 1.

Demographic and Clinical Characteristics of Youths with Bipolar Disorder (Training: n=182, Testing: n=181)

Intake Demographic Variables
Mean Age at Intake (SD)	12.6 (3.2)
Mean Age at the last follow-up (SD)	24.5 (4.6)
Mean Socioeconomic Status (SD)	3.4 (1.2)
Sex (% Female)	171 (47.1%)
Race (% Caucasian)	299 (82.4%)
Live with Both Biological Parents (%)	161 (44.4%)
Intake Clinical Variables
Mean Age of Mood Disorder Onset (SD)	9.4 (3.9)
Bipolar Disorder (BD) Subtype
BD-I	218 (60.1%)
BD-II	25 (6.9%)
BD-NOS	120 (33.1%)
Generalized Anxiety Disorder (%)	52 (14.3%)
ADHD (%)	208 (57.3%)
Disruptive Behavioral Disorders (%)	165 (45.5%)
Psychosis (%)	83 (22.9%)
Physical/Sexual Abuse (%)	72 (19.8%)
Polarity of the Index Episode (%)
Depression	51 (14.0%)
Mania	69 (18.9%)
Hypomania	30 (8.2%)
Mixed	62 (17.0%)
Not Otherwise Specified	153 (41.9%)
Mean Total Number of New Recurrences (SD)
Depression	2.3 (1.7)
Mania	1.3 (0.8)
Hypomania	1.5 (0.9)
Mixed	1.1 (0.3)
Lifetime (intake plus follow-up) Family History
Depression (%)	322 (88.7%)
Mania/Hypomania (%)	211 (58.1%)
Anxiety (%)	269 (74.1%)
ADHD (%)	168 (46.3%)
Conduct Disorder (%)	126 (34.7%)
Psychosis (%)	64 (17.6%)
Substance Use Disorder (%)	254 (70.0%)
Suicidality (%)	188 (51.8%)

Note: Disruptive behavior disorders indicates oppositional defiant disorder and/or conduct disorder. Substance use disorder indicates all alcohol and substance abuse and dependence. ADHD = attention-deficit/hyperactivity disorder;