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Table 5 The change in diagnosis by the selected reference for females

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 = 0.457 Agreement = 69.5% 6%
    NHANES diagnosis  
KNHANES diagnosis    Normal Osteopenia Osteoporosis  
n % n % n % n %  
Normal 741 53.10 390 28 351 25.1 0 0  
Osteopenia 622 44.60 0 0 547 39.2 75 5.4  
Osteoporosis 32 2.30 0 0 0 0 32 2.3  
Total 1,395 100.00 390 28 898 64.3 107 7.7  
60s k = 0.446 Agreement = 71.1% 13%
KNHANES diagnosis NHANES diagnosis  
  Total Normal Osteopenia Osteoporosis  
  n % n % n % n %  
Normal 414 24.40 155 9.1 259 15.3 0 0  
Osteopenia 1,100 64.80 0 0 870 51.2 230 13.6  
Osteoporosis 183 10.80 0 0 0 0 183 10.8  
Total 1,697 100.00 155 9.1 1,129 66.5 413 24.4  
70s k = 0.553 Agreement = 75%     19%
KNHANES diagnosis NHANES diagnosis   
  Total   Normal Osteopenia Osteoporosis  
  n % n % n % n %  
Normal 101 7.90 27 2.1 74 5.8 0 0  
Osteopenia 742 57.90 0 0 496 38.7 246 19.2  
Osteoporosis 439 34.20 0 0 0 0 439 34.2  
Total 1,282 100.00 27 2.1 570 44.5 685 53.4  
80s k = 0.565 Agreement = 82% 17%
KNHANES diagnosis NHANES diagnosis  
  Total   Normal Osteopenia Osteoporosis  
  n % n % n % n %  
Normal 8 2.60 1 0.3 7 2.3 0 0  
Osteopenia 99 32.40 0 0 51 16.7 48 15.7  
Osteoporosis 199 65.00 0 0 0 0 199 65  
Total 306 100.00 1 0.3 58 19 247 80.7  
  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.