Before being sentenced in late March, Bell will appear in court again for additional federal charges.
Misbehaved boys who lack guilt are less likely to laugh with their friends.
Children were told a story about a person who was "really, really smart" and their assumptions on the protagonist's gender were monitored.
The latest data show girl students far outperform their male counterparts.
A quarter of boys in England started school struggling to speak a full sentence last year, said Save the Children.
The Falling depicts a postwar England where female characters rebel against the norm.