The number of young Americans diagnosed with bipolar disorder has risen dramatically in recent years, according to a new study. This increase highlights the need for "reliability studies" to determine the accuracy of diagnoses of child and adolescent bipolar disorder, conclude the researchers in a report in the latest issue of the Archives of General Psychiatry. Bipolar disorder is a psychiatric illness that typically involves periods of mania (abnormally elevated mood) and depression. Dr. Mark Olfson, from Columbia University, New York and New York State Psychiatric Institute, and colleagues compared increases between 1994-1995 and 2002-2003 in office visits that culminated...