Fig. 2

Network of eligible comparisons for primary outcome. The width of the lines is proportional to the number of trials comparing every pair of treatments, and the size of every circle is proportional to the number of randomly assigned participants (sample size). Network of included studies for all other outcomes is shown in Additional file 3. a Network of absolute change of BMD at the femoral neck; b Network of percent change of BMD at the femoral neck; c Network of absolute change of BMD at the lumbar spine; (d) Network of percent change of BMD at the lumbar spine.