Year: 2005 Source: BMJ Online, v.330, no.7484, p.167-171 SIEC No: 20050144

The authors studied the association between intelligence test scores & subsequent suicide in 987,308 Swedish men measured at age 18 & followed up for 5-26 years. 2811 suicides occurred during follow up. The risk of suicide was 2 to 3 times higher in those with the lowest compared with the highest intelligence test scores. The strongest associations were seen with the logic test: for each unit increase in test score the risk of suicide decreased by 12%. Greatest risks were seen among poorly performing offspring of well educated parents. (15 refs)