Dual energy x ray absorptiometry device

Dual-energy X-ray absorptiometry device (Hologic, WI, USA) was used to assess the value of BMD (g/cm²). The anteroposterior L1-L4 and left proximal femur including the femoral neck and the total hip BMD were detected, and the T and Z values of each site were also recorded. According to the WHO diagnosis criteria, T − score > −1 was defined as normal bone mass, T − score ≤ −1 and >-2.5 was defined as osteopenia; whereas, T − score ≤ −2.5 was defined as OP based on bone densitometry [21 (link)]. After using the instrument daily, a professional staff was responsible for measuring the accuracy and debugging problems. The DXA scanner was calibrated every day, and the coefficient of variability values of the instrument was set at around 1%.

Dual-energy X-ray absorptiometry device (Hologic, WI, USA) was used to assess the value of BMD (g/cm²). The anteroposterior L1-L4 and left proximal femur including the femoral neck and the total hip BMD were detected, and the T and Z values of each site were recorded. According to the WHO criteria, the OP and non-OP populations were identified based on bone densitometry.

Dual-energy X-ray absorptiometry device (Hologic, WI, USA) was used to assess the value of BMD (g/cm²). The diagnosis of OP was based on the criteria outlined by the WHO and Chinese guidelines [21 (link)], T value > -1.0 was common; −2.5 ≤ T value ≤ −1.0 was osteopenia; T value < -2.5 was osteoporosis.