Diagnostic stability in children and adolescents with bipolar disorder, a nationwide register-based study

International Journal of Bipolar Disorders

Table 1 Characteristics of bipolar disorder (BD) in children and adolescents between 1995 and 2014

Variables	Total population included		Total population with 3-year follow-up
Variables	N	%	N	%
Children and adolescents with BD	519	100	478	92
Sex (females)	299	58	274	57
Family history of psychiatric disorders	162	32	–^a	–^a
Family history of bipolar disorder	57	11	–^a	–^a
Substance abuse total	53	10	48	10
Substance abuse, other than alcohol and cannabis	25	5	23	5
Diagnostic setting
Inpatient	201	39	188	39
Outpatient	318	61	290	61
Psychotic BD at index	92	18	90	19
Index BD prior to 2005	131	25	130	27
Index BD < 13 years	36	7	32	7
Latest psychiatric diagnosis prior to BD
Schizophrenia or related diagnosis	93	18	86	18
Affective disorders	130	25	117	24
Substance abuse	40	8	37	8
Other psychiatric disorders	286	55	263	55
Information about parents
Schizophrenia or related diagnosis	44	9	–^a	–^a
Affective disorders	111	22	–^a	–^a
Substance abuse	77	15	–^a	–^a
Other psychiatric disorders	9	2	–^a	–^a

Variables	Mean	SD	Mean	SD
Age at first ever BD	15.9	2.1	15.9	2.1
Age at first psychiatric contact	14.4	3.6	14.3	3.6

^aNumbers could not be reported in order to comply with the data protection rules set by Statistics Denmark in order to avoid allowing identification of individual patients in cells containing ≤ 5 patients