Research Findings The findings reviewed below on the relationship between social support and mortality are derived primarily from prospective studies with varying sample sizes. Among the findings are results from two large prospective investiga- tions (Berkman & Syme, 1979; House, Robbins, & Metzner, 1982) and an analysis (Blazer, 1982, 1983) of data collected during the validation of the Older Americans Resources and Services (OARS) at Duke University. Reports on the role of socio- economic status and mortality of individuals with cancer are also briefly considered in this section. Social support Social networks, host resistance, and mortality were evaluated (Berkman & Syme, 1979) in a nine-year follow-up survey of 3725 men and women ages 30-69 studied by the 1965 Human Population Laboratory, Alameda County, California. Each of the four sources of social contact studied was found to predict mortality independently of the other three. The strongest predictors were the more intimate ties of marriage and contact with friends and relatives. Marriage, contacts with close friends and relatives, church membership and informal and formal group associations made up the four categories of social contact studied by Berkman and Syme. According to the authors, with few exceptions, respondents with each type of social tie had