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Married couples with a household income of less than USD 60,000 per year had fewer depression symptoms than unmarried ones, according to a recent study. The study co-authored by a Georgia State University researcher examined data from the Americans' Changing Lives Survey, a national study consisting of interviews with 3,617 adults in the United States ages 24 to 89 at specific intervals over many years. "We looked at the interrelationships between marriage, income and depression, and what we found is that the benefit of marriage on depression is really for people with average or lower levels of income," said co-author Ben Lennox Kail.