Married folks tend to be more satisfied with life and suffer less depression than couples who are in long-term relationships without taking the vows, researchers say.

Bowling Green State University professor Susan Brown told a meeting of the American Sociological Association last week that the lack of satisfaction may be due to the "instability" of the unmarried couples' relationship.Brown's findings: Married people had an average depression score of 13.3, compared with a 17.2 average score for cohabitants.