Psychometric Properties of the Arabic Vanderbilt Children's ADHD Diagnostic Rating Scale (VADRS-A) in a Saudi Population Sample

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Pearson's Correlation Matrix of VADPRS-A_

Variable	In	Hy	Opp	Con	An	Per	VADPRS-A
In	-
Hy	0.700***	-
Opp	0.646***	0.737***	-
Con	0.418***	0.383***	0.500**	-
An	0.398***	0.296***	0.437***	0.573***	-
Per	0.603***	0.450***	0.490***	0.508***	0.423***	-
VADPRS-A	0.840***	0.816***	0.843***	0.698***	0.615***	0.763***	-

Fit indices of VADTRS-A

Index	Value
Comparative Fit Index (CFI)	0.958
Tucker-Lewis Index (TLI)	0.932
Bentler-Bonett Normed Fit Index (NFI)	0.951
Parsimony Normed Fit Index (PNFI)	0.720
Bollen's Relative Fit Index (RFI)	0.936
Bollen's Incremental Fit Index (IFI)	0.963
Root mean square error of approximation (RMSEA)	0.051
Goodness of fit index (GFI)	0.964

Sociodemographic characteristics of participants (parents+ teachers)_

Sociodemographic Variable	N (%)
Gender
Male	953 (52.59%)
Female	859 (47.41%)
Region
Riyadh	810 (44.70%)
Makkah Al-Mukarramah	509 (28.09%
Eastern Province	493 (27.21)
Nationality
Saudi	1461 (80.63%)
Non-Saudi	351 (19.37%)
Age
Younger than 30 years old	256 (14.13%)
30– 35 years old	505 (27.87%)
36– 40 years old	336 (18.54%)
41– 45 years old	323 (17.83%)
46– 50 years old	214 (11.81%)
51– 55 years old	154 (8.50%)
Older than 56 years old	24 (1.32%)
Children age
5– 6 years old	236 (13.02%)
7– 8 years old	493 (27.21%)
9– 10 years old	487 (26.88%)
11– 12 years old	596 (32.89%)

Factor characteristics of VADPRS-A_

Factor	Eigenvalues	Cumulative %
Factor 1	3.540	59.00

Factor characteristics of VADTRS-A_

Factor	Eigenvalues	Cumulative %
Factor 1	3.465	69.20

Component Loadings of VADPRS_A_

Components	VADTRS-A
Inattention	0.916
Performance	0.856
Hyperactivity and impulsivity	0.839
Oppositional defiant behavior	0.811
Anxiety/ depression	0.722

Fit indices of VADPRS-A_

Index	Value
Comparative Fit Index (CFI)	0.956
Tucker-Lewis Index (TLI)	0.942
Bentler-Bonett Normed Fit Index (NFI)	0.956
Parsimony Normed Fit Index (PNFI)	0.717
Bollen's Relative Fit Index (RFI)	0.925
Bollen's Incremental Fit Index (IFI)	0.956
Root mean square error of approximation (RMSEA)	0.049
Goodness of fit index (GFI)	0.952

Pearson's Correlation Matrix of VADTRS-A_

Variable	In	Hy	Opp	An	Per	VADTRS-A
In	-
Hy	0.720***	-
Opp	0.608***	0.710***	-
An	0.730***	0.432***	0.531**	-
Per	0.864***	0.602***	0.534***	0.533***	-
VADTRS-A	0.939***	0.834***	0.772***	0.669***	0.898***	-

Results of Cronbach's α and McDonald's ω coefficient of VADTRS-A

Variable	McDonald's ω	Cronbach's α
Inattention	0.968	0.967
Hyperactivity and impulsivity	0.921	0.921
Oppositional defiant behavior	0.919	0.914
Anxiety	0.856	0.858
Performance	0.943	0.948
VADPTS	0.965	0.971

Results of Cronbach's α and McDonald's ω coefficient of VADPRS-A

Variable	McDonald's ω	Cronbach's α
Inattention	0.908	0.906
Hyperactivity and impulsivity	0.923	0.925
Oppositional defiant behavior	0.901	0.900
Conduct disorder	0.871	0.896
Anxiety	0.850	0.853
Performance	0.877	0.872
VADPRS-A	0.925	0.959