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Table 2 Internal consistency and convergent validity of the QCD

From: The reliability and validity of the Questionnaire - Children with Difficulties (QCD)

Subscore of QCD Cronbach’s α  
   ODBI ADHD-RS
    Hyperactivity Inattention Total score
Early morning/before going to school 0.756 −0.419 −0.332 −0.448 −0.440
School 0.736 −0.241 −0.257 −0.355 −0.348
After school 0.680 −0.256 −0.279 −0.411 −0.398
Evening 0.775 −0.552 −0.429 −0.542 −0.547
Night 0.569 −0.262 −0.243 −0.279 −0.291
Overall behavior 0.728 −0.505 −0.400 −0.457 −0.474
Total 0.876 −0.514 −0.448 −0.575 −0.577
  1. All correlations were significant at p < 0.001.