To address the primary research questions in the present study, we followed our main effect analyses with moderator analyses, examining interactions between birth cohort and family socioeconomics as predictors of selection into ECEC at 18 months.
An additional adjustment of all primary outcome analyses for the random effect of "school" showed no further variance for those primary outcomes that were significantly improved by the intervention.
The primary effect measure for meta-analyses was the hazard ratio.
Systematic reviews and meta-analyses should include all available evidence to avoid selection bias and to increase the power of analyses of primary effects and effect modification by differences in patients and interventions.
Given that MA treatment induced significant injuries on shoot physiology and root growth from 24 h to 8 days, thus resulting in various secondary effects related to injury and bleaching, we chose to study plantlets at 24 h of treatment where primary effects of atrazine exposure could be analysed.
As above, the primary effects of interest remain significant when Non-verbal IQ was used as an additional covariate in the ANCOVA analyses (F 1,33)5.4, P0.027).
As above, the primary effects of interest remain significant when Non-verbal IQ was used as an additional covariate in the ANCOVA analyses (F 1,33)9.5, P0.004).
It should be noted that each of the primary effects of interest remain significant when Non-verbal IQ was used as an additional covariate in the ANCOVA analyses (F 1,18)4.6, P0.045), although this analyses should be considered exploratory given the sample size involved (Table 2).
Hypothesis 4c, of a positive effect of sabbaticals on perceived autonomy, cannot be tested in this meta-analysis, because no primary study analyses this effect.
33 In line with the use of random effects as primary analyses, 32 change scores were used for studies when no other data were forthcoming.
