Fig. 9

Meta-regression analysis showing the association of HDL concentration (WMD), and mean age and supplementation duration. Increment in HDL was associated with younger (β = − 1.03 CI − 1.63, − 0.42: p-value = 0.004) and longer duration (β = 0.59 CI 0.29, 0.89: p-value = 0.001) of treatment