Standardization and cross-cultural comparisons of the Swedish Conners 3® rating scales.

The present study shows that the Swedish adaptation of the Conners 3® provides consistent and reproducible scores. However, across-informant ratings were only modest and significant cross-cultural differences in scoring were observed. This emphasizes the need for multi-informant assessment as well as for national norms for rating instruments commonly used within child and adolescent psychiatry research and clinical settings.