Abstract
Influence of the measurement site's thickness on the measured values of bone mineral density (BMD) was examined by performing statistical analyses.
The measured values of BMD were classified into 7 groups (3.5,4.0,5.0,6.0,7.0,8.0, and 9.0 cm in thickness). The measurement site's thickness was found to influence the measured values of BMD as a result of one way layout analysis of variance (ANOVA). Furthermore, by Tukey's method, pairwise statistical differences were not found in thickness between 3.5 cm and 4.0 cm,3.5 cm and 5.0 cm, and 4.0 cm and 5.0 cm, but were found in thickness between other pairs of groups at p = 0.05 level.
When considering 5 groups (3.5∼5.0,6.0,7.0,8.0, and 9.0 cm in thickness), the result obtained by ANOVA was the same as that of the above 7 groups. Furthermore, by Scheffe's method, pairwise statistical differences were found in thickness between all pairs of groups at p= 0.01 level.
These results suggest that the measurement site's thickness influences the measured values of BMD.
