Table 2.

The effect of vitamin D and magnesium supplementation compared with placebo on behavior in children with ADHD based on strengths and difficulties questionnaire¹

Independent variables	Un adj.	Effect size (Cohen’s d)	Adj.		Effect size (Partial Eta)
	p-value		Covariate	p-value
Emotional problem	0.025	- 0.565	Sex Age BMI Ritalin dose Group	0.181 0.681 0.811 0.877 0.051	0.031 0.003 0.001 0.001 0.063
Conduct problem	0.096	- 0.416	Sex Age BMI Ritalin dose Group	0.053 0.018 0.010 0.007 0.117	0.06 0.092 0.110 0.130 0.041
Hyperactivity	0.28	- 0.269	Sex Age BMI Ritalin dose Group	0.061 0.966 0.070 0.15 0.275	0.06 0.001 0.055 0.035 0.02
Peer problem	0.003	- 0.760	Sex Age BMI Ritalin dose Group	0.110 0.001 0.002 0.002 0.006	0.045 0.165 0.156 0.157 0.122
Prosocial	0.18	- 0.334	Sex Age BMI Ritalin dose Group	0.248 0.085 0.106 0.019 0.170	0.023 0.049 0.044 0.090 0.031
Total difficulties	0.005	- 0.712	Sex Age BMI Ritalin dose Group	0.017 0.045 0.018 0.013 0.009	0.093 0.067 0.091 0.100 0.112
Externalizing	0.105	- 0.404	Sex Age BMI Ritalin dose Group	0.026 0.151 0.011 0.013 0.120	0.081 0.035 0.110 0.109 0.042
Internalizing	0.001	- 0.855	Sex Age BMI Ritalin dose Group	0.052 0.041 0.141 0.070 0.003	0.061 0.070 0.036 0.054 0.140

For comparison of continus variables ANCOVA test has been used

BMI, body mass index