Possible relationships between these variables and five behavior factor scores are examined. It is found that the gang boys are shorter than club boys at the sub-groups as well as the aggregate level. It is also found that gangs differ among themselves on age, height, and weight. These differences are related to differences in behaviors. Furthermore, gangs differ sharply among themselves in regard to the within-gang connections between age, height, and weight and behavior. Discussion centers upon group process effects. (Author abstract)