You've heard of The X Factor...but what about the M factor?

Scientists are using this name to describe an emerging syndrome linked to violence and misogyny.

'The M factor reflects an attitude that sees "true masculinity" as under threat,' explained study leader Dr Denis Ribeaud, from the University of Zurich.

'It is associated with notions of male supremacy, a propensity for violence, misogyny, contempt for sexual minorities and opposition to gender equality.

'Our data show that all these views are closely linked and can be traced back to a common underlying attitude.'