Dohrmann and colleagues (2007) examined the long term impacts of two public Montessori elementary
programs in Milwaukee Public Schools in an article in Journal of Research in Childhood Education. The study
included a large number of subjects, 201, and a control group matched on gender, race/ethnicity, socioeconomic
status, and high school attended. Using structural equation modeling the study found the students who had
attended the Montessori schools from the approximate ages of 3 to 11 significantly outperformed the control
group on Math/Science scores on standardized assessments in high school with no differences found on
English/Social Studies scores or grade point average (Dohrmann, 2003). While this study was unable to control
for parental influence, its size and careful matching make it an important contribution to the body of research on
Montessori education