“…In some cases, this paper estimated missing data using the method described by Hozo et al (2005) to calculate the mean and estimate the standard deviation (Wan et al, 2014). Missing data for three studies meant that it was impossible to obtain or *The following papers between brackets are one study using the same sample but reporting different outcomes (Baker-Henningham & Walker, 2018;Baker-Henningham et al, 2012), (Baker-Henningham et al, 2009a, 2009b, (Conroy et al, 2018(Conroy et al, , 2019Sutherland et al, 2018aSutherland et al, , 2018b, (Hoogendijk et al, 2018(Hoogendijk et al, , 2020, (LoCasale-Crouch et al, 2018;Williford et al, 2017), (Vancraeyveldt et al, 2015a(Vancraeyveldt et al, , 2015b, (Veenman et al, 2017(Veenman et al, , 2019 (Achenbach & Rescorla, 2000); CTRS, Conners Teacher Rating Scale (Goyette et al, 1978); DPICS, Dyadic Parent Child Inter-active Coding System (Eyberg & Robinson, 1981); EBP, Externalizing Behavior Problems; ECBI, Eyberg & Pincus (Eyberg, 1999); MOOSES, Multi-Option Observation System for Experimental Studies (Tapp et al, 1995); MPROX, Most Proximal; OREVS, Observer Rating of Ecobehavioral Variables Scale (Chandler et al, 1999); PBLIND, Probably Blinded; PBQ, Preschool Behavior Questionnaire (Behar, 1977); PRO, Prosocial; SCP, Social Competence Performance Checklist (Stoiber, 2004); SDQ, Strengths and Difficulties Questionnaire …”