Underlying structure and internal consistency of the Bruininks-Oseretsky Test of Motor Proficiency-Long Form, in Greek preschool and primary school children

The purpose of the current study was to examine the underlying structure and the internal consistency of the Bruininks-Oseretsky Test of Motor Proficiency-Long Form in Greek preschool and primary school aged children. The participants were 403 children (222 preschoolers and 181 primary school students) from Macedonia and Thrace. The data were analyzed via the principal factor analysis. The factor analysis pro- duced four factors: coordination with emphasis in precision of movement (α=.68), upper-limb speed and accuracy (α=.45), speed of movement and response ability (α=.62) and upper-limb accuracy (α=.73). All Pearson correlation coefficients between single-item scores and total scores were statistically significant except the tests standing on preferred leg on balance beam and tapping foot and finger on same side synchronized. The Cohen's effect size in-