The Conners Abbreviated Teacher Rating Scale: development of norms in Brazil.

Normative data for the Conners Abbreviated (10-item) Teacher Rating Scale (CATRS-10) derived from 1,068 children in Brazil are presented. Ratings of boys were higher than ratings of girls, and younger children had higher ratings than older children. Test-retest reliability data indicate that the CATRS-10 has acceptable reliability in Brazil but only when the same teacher rates the child at both test and retest (interval of 1 to 3 months). This study found that ratings at retest were significantly lower than ratings at first test whether or not the same teacher rated the child on both occasions. The CATRS-10 was shown to be a valid instrument in Brazil since children with behavioral problems requiring medical or psychological treatment were rated higher than children without such problems.