Correlation between mean body mass index in the population and prevalence of obesity in Brazilian capitals: empirical evidence for a population-based approach of obesity

Table 2 Association of mean BMI (‘non-obese’ ^* and total) and prevalence of obesity in the adult population in the adult population (20–59 years) living in 26 state capitals by sex and age group, Brazil, 2002-2003

BMI	Age group (Years)		Male				Female
		r^Ŧ	p-value	b₁×100^ǂ	CI 95%^¶	r^Ŧ	p-value	b₁×100^ǂ	CI 95%^¶
Total mean	20-39	0.4	0.040	2.3	0.1 - 4.4	0.9	<0.001	3.4	2.5 - 4.3
“Non-obese” mean ^*	20-39	−0.1	0.604	- 0.7	- 3.2 - 1.9	0.2	0.439	0.9	- 1.4 - 3.1
Total mean	40-59	0.8	<0.001	5.7	3.7 - 7.8	0.9	<0.001	5.5	4.3 - 6.6
“Non-obese” mean ^*	40-59	−0.2	0.445	- 2.0	- 7.1 - 3.2	0.3	0.222	2.5	- 1.6 - 6.7
Total mean	20-59	0.6	0.001	4.0	1.7 - 6.3	0.9	<0.001	3.4	2.6 - 4.3
“Non-obese” mean ^*	20-59	0.0	0.827	0.4	- 3.1 – 3.9	0.6	0.002	3.3	1.4 - 5.3

*Average Body Mass Index of the population after exclusion of obese individuals (BMI ≥ 30 kg/m²).
^Ŧr. Pearson correlation coefficient.
^ǂb₁ coefficient values indicate the average variation in the prevalence of obesity associated with a one unit reduction of the population mean BMI.
^¶95% confidence interval.

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