Table 2.

Effects of age, weight and residence on bone mineral density: estimates of parameters of the analysis of covariance stratified by sex and BMD site

Effect	Estimate ± SE	P value
Men
Femoral neck BMD
Age (+5 yr)	-0.020 ± 0.003	<0.001
Weight (+5 kg)	0.015 ± 0.004	<0.001
Residence (Rural)	0.222 ± 0.046	<0.001
Age × Residence (Rural)	-0.012 ± 0.004	0.008
Lumbar spine BMD
Age (+5 yr)	-0.001 ± 0.003	0.874
Weight (+5 kg)	0.030 ± 0.004	<0.001
Residence (Rural)	0.122 ± 0.051	0.017
Age × Residence (Rural)	-0.010 ± 0.004	0.048
Women
Femoral neck BMD
Age (+5 yr)	-0.026 ± 0.002	<0.001
Weight (+5 kg)	0.026 ± 0.003	<0.001
Residence (Rural)	0.233 ± 0.034	<0.001
Age × Residence (Rural)	-0.015 ± 0.003	<0.001
Lumbar spine BMD
Age (+5 yr)	-0.033 ± 0.003	<0.001
Weight (+5 kg)	0.031 ± 0.003	<0.001
Residence (Rural)	0.047 ± 0.045	0.293
Age × Residence (Rural)	-0.009 ± 0.004	0.036

SE, Standard Error.

Notes: Since height was not a significant factor in the analysis of covariance model, it was removed from the final model with no significant change of the results.