Sounds like they had a control for this, though, because they claim to have investigated whether the teacher was male or female. Only differences seemed to be c

Sounds like they had a control for this, though, because they claim to have investigated whether the teacher was male or female. Only differences seemed to be class size and whether the school was technical/academic or vocational. My pet theory would be boys tend to have worse handwriting. So it could be that the worse handwriting is more frequently misinterpreted or simply marked as wrong by teachers.