OBJECTIVES

To study the prevalence of obesity, overweight and thinness, by sex, SES and ethnic background in 2006 and 2012.

METHODS

Large national surveys of school students were conducted. Height/weight was measured. The outcomes were height, weight, BMI, thinness, overweight and obesity (IOTF), SES and ethnicity.

RESULTS

Obesity in 2006 and 2012 in boys and girls was 7.5 and 7.1 %, and 5.8 and 5.6 %; being overweight was 17.7 and 18.5 %, and 18.9 and 18.7 %; thinness was 3.8 and 4.6 %, and 5.0 and 6.0 %. Independent predictors of obesity in 2006 and 2012 were being Pacific Islander (OR 5.03, 5.66), Middle Eastern (OR 3.64, 1.50), aboriginal (OR 2.43 in 2012 only), African (OR 1.99 2012 only), Southern European (OR 1.75, 1.72), low SES (OR 2.22, 2.20), middle SES (OR 1.52, 1.60), female (OR 0.77, 0.82) and adolescent (OR 1.08, 2012 only). Predictors of thinness in 2006 and 2012 were ethnicity: Indian (OR 5.29, 1.96), African (OR 2.71, 2006 only), Asian (OR 1.69, 1.57) and female (OR 1.30, 1.27).

CONCLUSIONS

The predictors of obesity and thinness were ethnically based, suggesting culturally appropriate interventions in socially and economically disadvantaged communities.