One Australian study appears to have found such a correlation.
A number of studies found a positive correlation between video game play and increased violent behavior.
Researchers found no correlation between the quantity of child care and behavior problems.
Using data from 1,000 1988 annual reports, the survey found a close correlation between industry performance and pay increases.
The study also found a correlation between poverty and mortality rate.
Studies have also found a correlation between domestic violence and increased use of abortion.
No study has found a simple correlation, for example, between testosterone levels and crime.
Numerous studies have found no real correlation between aid levels and the economic performance of developing countries.
Some studies have found correlations between wealth and lack of religious beliefs.
Some studies, however, have found statistical correlations between various diseases and living or working near power lines.
