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Table 2 Adjusted means of bone mineral density by quartiles of waist circumference

From: Sex-related differences in the association between waist circumference and bone mineral density in a Korean population

   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
  1. 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).