Table 1.

Diagnostic information by group.

	Probands (%)	Cotwins of Probands (%)	Matched Controls (%)
Major depressive disorder	23.9	7.1	2.2
Social anxiety disorder	8.7	7.2	10.8
Separation anxiety disorder	15.2	7.2	2.2
Agoraphobia	13.1	9.5	4.4
Panic disorder	10.9	14.3	4.4
Generalized anxiety disorder	15.2	2.4	4.4
Specific phobia	26.1	21.4	17.4
Obsessive-compulsive disorder	19.6	7.2	6.7
Post-traumatic stress disorder	21.7	11.9	4.3
Eating disorder (anorexia nervosa or bulimia nervosa)	19.5	9.5	4.4
Attention-deficit/hyperactivity disorder	17.3	7.2	6.5
Oppositional defiant disorder	8.7	14.2	10.9
Conduct disorder	2.2	2.4	0
Tic disorder	0	0	2.2
Selective mutism	4.3	2.4	0
Dysthymia	0	2.4	0

Note. Diagnoses are based on Diagnostic and Statistical Manual of Mental Disorders, 4^th Edition (DSM-IV) criteria.