Prevalence of children who meet DSM criteria for BD is between 0.1%[1] and 6%,[unreliable medical source?][10] with an average rate of 0.5% for bipolar I, and 2% for bipolar spectrum disorders based on a meta-analysis of published studies.[11] Studies vary in which categories they include (for example, some only focus on bipolar I, and others include cyclothymic disorder and bipolar Not Otherwise Specified, and DSM criteria are interpreted differently by different researchers).[12]