Figure 4. Comparison of the prevalence rates of osteoporosis diagnosed (subjects 40 years of age n=821) with parameters in groups reference to World Health Organization (WHO) criteria. SBAG, small bone area group; MBAG, medial bone area group; GBAG, great bone area group; PA-aBMD, areal bone mineral density at posteroanterior spine; Lat-aBMD, areal bone mineral density at lateral spine; vBMD, volumetric bone mineral density.