<qa>  How many children were targeted for follow-up?14 years after the end of the trial, participants cognitive abilities and educational attainment were assessed. Associations have been found between malaria infection and poor cognitive ability but causality has not yet been demonstrated through preventative trials and the long-term impact of malaria has not been investigated. 1190 children who had participated in the original trial for at least one year were targetted for follow-up. 579 were traced. Those who had received chemoprophylaxis attended school for 0.52 years more than the placebo group p.069. There was no overall effect on cognitive abilities but there was a significant treatment effect for cohorts that had not received chemoprophylaxis at the end of the trial or who had received less than one year of post-trial prophylaxis 