only marginally significantp = 0 . 09
When we rerun the analysis only for those studies where results were not rated as having a high risk of bias, the overall average effect on time studying is larger in magnitude but less precise and only marginally significant ( SMD ^ Low or med BOB = 0 . 17 ; 95 % CI: − 0 . 03 to 0 . 38 ; p = 0 . 09 ; k = 3 ).