Hann et al (1987) looked at the mortality rate of residents in a poor neighbourhood in the US over a period of 9 years. All participants in the study were 35 years or older. The members of the community were matched with the national averages based on several variables. These included, age, sex, income, employment status, access to medical care, health insurance coverage, smoking, alcohol consumption, physical activity and body mass index, sleep patterns, social isolation, martial status and diagnosis of depression.
Found the rate of mortality was 1.71 higher than the national average across all variables. This means that residents of the poor neighbourhood were almost twice as likely to die of health related causes. Support the hypothesis that one's socioeconomic environment may be an important risk factor for poor health and early mortality.