They attended five elementary schools of a northern Greece region .
The original sample consisted of 232 students ( 109 boys and 123 girls ) , with a mean age of 11.61 ( 0.49 ) .
students attended five elementary schools of a northern Greece region .
The original sample consisted of 232 students ( 109 boys and 123 girls ) , with a mean age of 11.61 ( 0.49 ) .