Lunar DPX-IQ, Operator'S Manual, Page: 144 / 166

I-2 Comparison to Reference Population DPX-IQ Operator’s Manual
I.2 Reference Population Database
The comparison values used in DPX software are supported by a large database from
studies of the reference population (tables I-1 thru I-5). Research was conducted at
university medical centers and clinics in the US, England, and Northern Europe. The
variation of mean BMD values among geographical sites contributing normal data
was about 1.3% (SD/mean). All data from these studies were acquired with LUNAR
DPX instrumentation. Table I-1 lists the number of subjects in the reference
population for each measurement site.
Tables I-2 and I-3 list the mean BMD values used as DPX’s AP spine reference data.
BMD values are presented in grams per centimeter squared (g/cm
2
) in ten-year
intervals. The regions of interest are AP spine L2-L4 and lateral spine L2+L3.
Table I-1: Number of male and female subjects in the reference population for each
measurement site.
Site Male Female
AP Spine
32–34,36,47-49
1460 8905
Lateral Spine
35,37 392 1318
Proximal Femur
32-36,48,50 1611 7524
Total Body
7,14,32,39,40,41 655 2154
Radius Shaft
14,38,39
987 1685
Table I-2: Mean BMD values for AP spine L2-L4 (SD = 0.12 g/cm
2
) BMD values are
listed for US/Europe populations.
32–34,36,48-50
Female Male
Age n Mean n Mean
20–29 672 1.200 131 1.241
30–39 916 1.214 164 1.215
40–49 1630 1.180 185 1.180
50–59 2472 1.096 250 1.145
60–69 1942 1.016 400 1.157
70–79 1273 0.988 330 1.173
Total 8905 1460