"According to the summary, interrogators concluded that most foreign fighters are Sunni Muslim men from 18 to 30, with the mean age of 22. They are almost always single males with no children, and tend to be students or hold blue-collar jobs ranging from taxi drivers to construction and retail sales. The summary went on to describe the majority of the fighters as having six to 12 years of schooling, with very few having gone to college. Most come from families in the poor or middle-classes and have six to eight siblings."