No idea. I'm just talking about some science that I've read a while back. I assume the research subjects were mostly non-muslim, so most likely follow the social norms of their culture.
Obviously men and women in happy marriages are better off than men and women in unhappy marriages. The research indicated that men in marriages that they self-identified as "bad" measured higher on happiness scales than men of the same age who were single, and women who self- identified as being in "bad" marriages measured lower in happiness scales than women of the same age who were single. (Single is defined as not currently married, whether never married, divorced, or widowed. )
Sorry, I can't link the research. I read it analog, a long time ago, and it isn't important enough to me to search for it online.