The weight of school grades: Evidence of biased teachers' evaluations against overweight students in Germany.

Discrimination and prejudice against overweight people is common in Western societies. In this article we aim to understand whether these attitudes reverberate into the school setting, by investigating whether teachers grade overweight students more severely than comparable normal weight students. By relying on the Attribution-Value Model of Prejudice (AVMP) and previous studies, we test a series of hypotheses using data from the German National Educational Panel Study (NEPS SC3) on a sample of students enrolled in the 7th grade (lower secondary education). We used hierarchical ordered logit regression to assess whether overweight and obese students receive systematically lower grades by their teachers in German and mathematics, adjusting for subject-specific competences measured with a standardized test, and a rich set of socio-demographic and socio-psychological students' characteristics (e.g. the "big five"). Results suggested that overweight and obese students were more severely graded in both subjects. The penalty for overweight students, and especially for obese students, was slightly larger in German and in the lowest part of the grade distribution. There was also indication of heterogeneous penalties by gender, with overweight male students being especially penalized in math. Possible ways to help teachers in assigning grades in a fairer way are discussed at the end.