Polygenic risk score for bipolar disorder and school grades.

• There was no significant association between the polygenic risk score (PRS) for bipolar disorder and not completing 9th grade at term. • Among randomly selected population controls, who completed the 9th grade at term, there was a statistically significant positive linear relationship between the PRS for bipolar disorder and exam grades in Danish (i.e., native language). • Among randomly selected population controls, who completed the 9th grade at term, having very low PRS for bipolar disorder was associated with obtaining exam grades below the average. [ABSTRACT FROM AUTHOR]