Results of a 14 year study of 79 couples living in the USA has provided some insights into 4 usual predictors of divorce. When the psychologists added questions about things like relationship satisfaction and how many times the research subjects had thoughts about separating to the mix, they could predict which marriages would end in divorce 93% of the time.

The figure was so striking it spurred the researchers to label the four behaviours "the four horsemen of the apocalypse."