Table 2.

Adjusted means of bone mineral density by quartiles of waist circumference

		Quartile of waist circumference
		1st	2nd	3rd	4th	P for trend	P for interaction
Number (men/women)		898/1346	894/1355	896/1345	904/1343
Range (men/women, cm)		(57.0-82.2)/(58.4-82.5)	(82.3-87.2)/(82.6-88.6)	(87.3-92.1)/(88.7-94.2)	(92.2-115.0)/(94.3-130.1)
Model 1	Lumbar spine
	Men	1.189 ± 0.009	1.185 ± 0.006	1.153 ± 0.006	1.117 ± 0.009	<0.001
	Women	0.999 ± 0.005	0.996 ± 0.004	0.977 ± 0.004	0.967 ± 0.005	<0.001	0.001
	Femoral neck
	Men	0.903 ± 0.005	0.896 ± 0.004	0.875 ± 0.004	0.851 ± 0.005	<0.001
	Women	0.797 ± 0.003	0.794 ± 0.003	0.787 ± 0.003	0.772 ± 0.003	<0.001	0.008
Model 2	Lumbar spine
	Men	1.185 ± 0.009	1.184 ± 0.006	1.154 ± 0.006	1.120 ± 0.009	<0.001
	Women	0.998 ± 0.005	0.996 ± 0.004	0.978 ± 0.004	0.968 ± 0.005	<0.001	0.001
	Femoral neck
	Men	0.896 ± 0.005	0.895 ± 0.004	0.877 ± 0.004	0.856 ± 0.005	<0.001
	Women	0.794 ± 0.003	0.794 ± 0.003	0.788 ± 0.003	0.774 ± 0.003	<0.001	0.016

Values are mean difference with 1st quartile group in g/cm² with 95% confidence interval, adjusted age, height, weight, and regular exercise (model 1) or age, height, weight, regular exercise and body fat percent (model 2).