High neighbourhood-level deprivation and low levels of neighbourhood collective efficacy (social cohesion and informal social control) are believed to work together to increase the development of conduct disorder (CD) behaviours, such as lying, fighting, stealing. However, in practice, neighbourhood deprivation has typically not been examined longitudinally and deprivation has often been solely based on neighbourhood-level socioeconomic status rather than a wide range of objective census-level indicators. In addition, CD behaviours have typically been examined using a summed score of behaviours, rather than assessing what particular CD behaviours (e.g., physical aggression) interact with low levels of social cohesion, informal social control and associated risks (e.g., affiliating with deviant peers) under varying levels of longitudinal deprivation exposures.