Genetic

• Genetic theories: Twin studies
• Genetic theories: Twin studies

  • Christiansen's study (1997):
  • Concordance rate = 35% MZ vs 13% DZ for males and 21% MZ vs 8% DZ for females.
• Genetic theories: Twin studies

  • Ishikawa and Raine (2002):
  • Concordance rate = 44% MZ vs 21% DZ for criminal behaviour
• Genetic theories: Twin studies

  • Johannes Lange (1929):
  • Concordance rate = 10/13 MZ vs 2/17 DZ for criminal behaviour