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Table 4 The change in diagnosis by the selected reference for males

From: The effects of the Korean reference value on the prevalence of osteoporosis and the prediction of fracture risk

  Cohen’s k % of agreement Prevalence difference
50s k = 0.668 Agreement = 83.3% 1%
    NHANES diagnosis  
KNHANES diagnosis    Normal Osteopenia Osteoporosis  
n % n % n % n %  
Normal 744 51.40 744 51.4 0 0 0 0  
Osteopenia 685 47.30 230 15.9 455 31.4 0 0  
Osteoporosis 19 1.30 0 0 11 0.8 8 0.5  
Total 1,448 100.00 974 67.3 466 32.2 8 0.5  
60s k = 0.661 Agreement = 81.1% 3%
    NHANES diagnosis  
KNHANES diagnosis    Normal Osteopenia Osteoporosis  
n % n % n % n %  
Normal 514 36.40 514 36.4 0 0 0 0  
Osteopenia 807 57.20 226 16.1 581 41.1 0 0  
Osteoporosis 91 6.40 0 0 40 2.8 51 3.6  
Total 1,412 100.00 740 52.5 621 43.9 51 3.6  
70s k = 0.654 Agreement = 81.4% 6%
    NHANES diagnosis  
KNHANES diagnosis    Normal Osteopenia Osteoporosis  
n % n % n % n %  
Normal 177 18.40 177 18.4 0 0 0 0  
Osteopenia 634 66.00 123 12.8 511 53.2 0 0  
Osteoporosis 150 15.60 0 0 56 5.8 94 9.8  
Total 961 100.00 300 31.2 567 59 94 9.8  
80s k = 0.633 Agreement = 78.1% 9%
    NHANES diagnosis  
KNHANES diagnosis    Normal Osteopenia Osteoporosis  
n % n % n % n %  
Normal 20 10.90 20 10.9 0 0 0 0  
Osteopenia 104 56.80 23 12.6 81 44.2 0 0  
Osteoporosis 59 32.30 0 0 17 9.3 42 23  
Total 183 100.00 43 23.5 98 53.5 42 23  
  1. McNemar-Bowker p-value for all comparisons < 0.001.
  2. NHANES, National Health and Nutrition Examination Survey; KNHANES, Korea National Health and Nutrition Examination Survey.