Female middle school students with body dissatisfaction from two sites [ Study 1 : N = 81 , M age = 12.1 , standard deviation ( SD ) = 0.9 ; Study 2 : N = 52 , M age = 12.5 , SD = 0.8 ] were randomized to a dissonance intervention ( MS Body Project ) or educational brochure control ; Study 2 included a 3-month follow-up .