The aim of this thesis was to investigate socio-economic status in relation to morbidity and mortality, in particular cardiovascular disease among women using data from two population based studies from Sweden. The secondary aim was to explore mechanisms potentially linking socio-economic status to health, assessing for example dental, dietary, and lifestyle factors. Samples: The Population Study of Women in Gothenburg Sweden was begun in 1968-69. A representative random sample of 1,622 women was selected according to date of birth and within the strata 38, 46, 50, 54, and 60 years of age; the participation rate was 90 percent. The Gerontological and Geriatric Population Studies in Gothenburg (H-70) are based on representative samples of 70-year olds from Göteborg, Sweden who participated in a series of cross sectional and longitudinal studies between1971 and 2000. Participation rates ranged from 86 percent for men and 83 percent for women in the 1901/2 birth cohort to 65 percent for men and 69 percent for women in the 1930 birth cohort. Main results: High socio-economic status was associated with a decreased risk for cardiovascular disease [RR 0.49; CI 0.24 – 0.99] in middle aged women independently of risk factors such as smoking and obesity;moreover opposing monotonic trends were seen for mortality from cancer and cardiovascular disease in relation to socio-economic status. Tooth loss, a proxy for cumulative lifetime oral infection was also associated with an increased risk for cardiovascular disease in women independently of socio-economic factors such as the husband’s occupational category, income, and educational level. Among 70-year old cohorts, later-born women were heavier and had higher body mass index than earlier-born women within the high education group only. However, secular increases in waist-hip ratio were seen in both educational groups. Compared to earlier-born cohorts of 70-year old men, later-born cohorts had higher body mass index and cholesterol levels across social strata, and heart disease and diabetes mellitus became more prevalent. Among the elderly, secular trends indicated greater improvements in cardiovascular risk factors among women than men, with exception to smoking and alcohol consumption. Diet quality and food selection were assessed in relation to socio-economic status in the youngest cohort of 70-year olds born in 1930. Socio-economic disparities in diet quality were detected in men but not in women. Conclusions: From a public health perspective, it is suggested that risk factor patterns should be investigated in association with socio-economic status in order to expose health inequalities, and to develop more equitable interventions for cardiovascular disease prevention.