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Table 3 The mean bone mineral density (g/cm 2 ) by age group

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

Age Male KNHANES 2008–2011 Female KNHANES 2008–2011 NHANES III
n Mean SD T* n Mean SD T* n Mean SD T*
20–29 976 0.9123 0.1336 a 1,236 0.7740 0.1045 a 409 0.8525 0.1189 a
30–39 1,569 0.8507 0.1195 b 2,098 0.7587 0.1030 b 518 0.8310 0.1210 a
40–49 1,591 0.8254 0.1160 c 2,071 0.7572 0.1043 b 444 0.7934 0.1273 b
50–59 1,449 0.7879 0.1118 d 1,996 0.6976 0.1011 c 450 0.7401 0.1196 c
60–69 1,412 0.7453 0.1125 e 1,778 0.6159 0.0881 d 454 0.6820 0.1206 d
70–79 962 0.6864 0.1103 f 1,283 0.5486 0.0876 e 556 0.6245 0.1088 e
80–89 183 0.6329 0.1176 g 306 0.3982 0.0809 f 420 0.5694 0.1057 f
  1. SD, standard deviation; KNHANES, Korea National Health and Nutrition Examination Survey.
  2. Welch test: p < 0.001.
  3. *Post-hoc analysis (Tamhane’s T2); the letters represent the significant difference by age group.