Marriage wards off blues, just don't end it.

Study found that getting married, compared to not getting married, was good for the mental health of both genders, not just women, as previous studies had found.
The study, however, did find that men are less likely to become depressed in their first marriage than women, a factor was probably linked to the traditional gender roles at home, as other WMH surveys have shown that as women get better educated, depression rates tend to fall.

The other gender difference the study found is that getting married reduces risk of substance use disorders more for women than for men. This may be explained by the fact that women are usually the primary caregiver for young children.