Table 1.

Covariates included in the regression models.

Variable	Description
Alcohol Consumption	Less than 21 units per week for men/14 units per week for women compared with greater than 21 units per week for men/14 units per week for women.
Smoking	Current cigarette smokers were compared to those who did not currently smoke cigarettes.
Difficulty sleeping	Those currently suffering from difficulties sleeping were compared to those having no difficulties sleeping.
Gender	Males and females were compared.
Age	Age was compared based on a median split (22-45 years compared to 46-67 years).
Neuroticism	Median split (score of 10 or less was compared to a score of more than 10).
Total negative job score	Median split (score of 17 or less was compared to a score of more than 17).