In table 1, a comparison between different frequencies on bone is made. Which is better, a higher or lower frequency?

Define mechanical observation. Two devices that do not need direct participation.

Changes in cortical bone density and bone geometry occur with aging in both men and women (Table 1 from Russo 2003). These changes manifest as decreased bone strength, which has the clinical impact of increasing the risk of fracture with increasing age. However, elderly men are much less prone to fracture than elderly women. It has been suggested that age-related bone loss is the consequence of endosteal bone resorption resulting in changes in bone geometry (~2mm less cortical bone thickness in women as they age) and contributing to relative differences in fracture risk between men and women. Cortical bone area decreases in women between the ages of 20 and 85, whereas there is no significant change in cortical bone area for men over the same age range (Table 1). Table 1: Changes in bone density and cortical bone area - from Italian population of 612 men and 693 women Age group (years) ANOVA 20-39 Total bone density 4% (mg/cm³) Men Women Cortical bone area 38% (mm²) Men 318.9±47.9 Women…

what is this material made of

*answer in significant figures