The estimated prevalence of bipolar disorder is over 3 per cent of the population of the United States. This may only be a part of the picture as many patients who currently take anti-depressant medication for depression, screen positive for bipolar disorder symptoms. For example, in one study, over 21 per cent who screened positive for bipolar disorder had not been diagnosed as such. The characteristics of this particular sample were that they tended to be white, single, lived alone and were...