Even within this age range, there were no large differences between regions. There appeared to be more variation between regions when area types were examined separately. Respondents in the Midwest and West reported a greater average proportion of adult gang members in large cities and suburban counties. Agencies in the South reported a greater average proportion of adult gang members in large cities and rural counties. There were too few observations available for estimates in the Northeast.
Population size appears to be a significant correlate of the age of gang members.
The differences in age by population size were found to be statistically significant. The survey results suggest that adult gang members are more prevalent in cities that have a long history of gang problems. He also observed that newer gang cities do not have many gang members in the upper age ranges. Compared with their counterparts in newer suburban counties, agencies in older suburban counties reported 5 percent more adult gang members.