“…We conduct a metaanalysis in which we initially include nine European studies on PD based on data from Denmark, France, Germany, The Netherlands, and Wales. The studies have different focus points despite all being concerned with child outcomes: Literacy, reading or language (Ecalle et al, 2015;Cviko et al, 2014 andHenrichs andLeseman, 2014), matematics (Gasteiger, 2014), or behavior and self-regulation (Hutchings et al, 2013;Jensen et al, 2013;Jensen et al, 2015;Perels et al, 2009 andRönnau-Böse et al, 2009). Thus, after restricting the studies of interest to be concerned with PD effects on child outcomes, there is a lot of variation in the actual outcomes investigated.…”