“…Kruskal-Wallis tests ( H (degree of freedom)) are used to investigate whether dose or duration have an impact on intervention outcome. References of the studies assessing subjective memory [ 31 , 32 , 34 – 37 , 43 – 45 , 48 , 51 ], objective memory (all) [ 31 , 33 – 36 , 38 – 47 , 49 , 50 , 52 ], objective memory (cognitive only) [ 31 , 33 – 36 , 42 – 47 , 49 , 50 , 52 ], executive function and attention [ 31 – 39 , 41 , 43 , 46 , 47 , 51 , 52 ], global cognition [ 31 , 33 , 38 , 39 , 41 , 43 ], and mood and quality of life [ 31 , 32 , 34 , 35 , 38 , 40 , 41 , 43 , 45 , 46 , 49 , 51 , 52 ]…”