Type B personality

Type B personality is a term used to describe people who tend to be
 * Relaxed
 * Likelier than a Type A personality to be patient
 * Creative and imaginative
 * Inclined to self-analyze

In the 1950s, the cardiologist Meyer Friedman argued that risk of heart disease is greater in Type A personality people than in Type B personality people.

Reference

 * term explanation on BehaveNet® Clinical Capsule