Illness

• Yusef et al. study

  found correlation between heart attacks and chronic stress, supporting the role of stress in illness
• Stress and illness evaluation

  + Kielcolt-Glaser :

  • found correlation between chronic stress response and immunity
  • suggests stress and illness are associated

  - counterpoint:

  • Kielcolt-Glaser data was correlational
  • cannot prove stress caused illness

  - Lack of control in research

  • most studies are naturalistic
  • low control of extraneous variables lowers validity