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Opposing socioeconomic gradients in overweight and obese adults

Markwick A, Vaughan L, Ansari Z

Australian and New Zealand journal of public health, 2013

Abstract

OBJECTIVE: Investigate the relationship between socioeconomic status (SES) and prevalence of overweight and/or obesity, by sex, using total annual household income as the indicator of SES and the World Health Organization (WHO) recommended ranges of self-reported Body Mass Index (BMI) as the indicator of overweight and/or obesity.

METHODS: Total annual household income and BMI data were obtained from the Victorian Population Health Survey (VPHS), an annual computer-assisted telephone survey of the health and well-being of Victorian adults aged 18 years and older. Statistical analysis was conducted using ordinary least squares linear regression on the logarithms of age-standardised prevalence estimates of overweight (25.0-29.9 kg/m(2)), obesity (≥ 30.0 kg/m(2)), and overweight and obesity combined (≥ 25.0 kg/m(2)), by income category and sex.

RESULTS: Typical SES gradients were observed in obese males and females, where the prevalence of obesity decreased with increasing income. No SES gradient was observed in overweight females, however, a reverse SES gradient was observed in overweight males, where the prevalence of overweight increased with increasing income. Combining the overweight and obesity categories into a single group eliminated the typical SES gradients observed in males and females for obesity, and resulted in a statistically significant reverse SES gradient in males.

CONCLUSIONS: Combining the BMI categories of overweight and obesity into a single category masks…

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Evidence Hub reads this as a cross-sectional, done in people. Its evidence level is 4 of 5 (Low · observational). Observational designs can show an association but not prove cause.

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