Educational level, relative body weight, and changes in their association over 10 years: an international perspective from the WHO MONICA Project
A Molarius, JC Seidell, S Sans, J Tuomilehto and K Kuulasmaa
MONICA Data Centre, Department of Epidemiology and Health Promotion, National Public Health Institute, Helsinki, Finland. anu.molarius@kau.se
OBJECTIVES: This study assessed the consistency and magnitude of the
association between educational level and relative body weight in
populations with widely different prevalences of over-weight and
investigated possible changes in the association over 10 years. METHODS:
Differences in age-adjusted mean body mass index (BMI) between the highest
and the lowest tertiles of years of schooling were calculated for 26
populations in the initial and final surveys of the World Health
Organization (WHO) MONICA (Monitoring Trends and Determinants in
Cardiovascular Disease) Project. The data are derived from random
population samples, including more than 42,000 men and women aged 35 to 64
years in the initial survey (1979-1989) and almost 35,000 in the final
survey (1989-1996). RESULTS: For women, almost all populations showed a
statistically significant inverse association between educational level and
BMI; the difference between the highest and the lowest educational tertiles
ranged from -3.3 to 0.4 kg/m2. For men, the difference ranged from -1.5 to
2.2 kg/m2. In about two thirds of the populations, the differences in BMI
between the educational levels increased over the 10-year period.
CONCLUSION: Lower education was associated with higher BMI in about half of
the male and in almost all of the female populations, and the differences
in relative body weight between educational levels increased over the study
period. Thus, socioeconomic inequality in health consequences of obesity
may increase in many countries.
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