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Table 5 The comparison of the mean score of different domains of parent reported SDQ between children with nail biting (> = 1 day per week) and that of those without nail biting.

From: Prevalence of nail biting and its association with mental health in a community sample of children

Scale Nail biting Mean Standard Deviation 95% Confidence Interval for Mean
     Lower Bound Upper Bound
Prosocial behavior score Without 8.15 1.6 8.0 8.3
  With 7.6 2.0 7.2 7.9
Hyperactivity/inattentiveness scale Without 5.5 1.6 5.4 5.7
  With 5.8 1.7 5.5 6.0
emotional problem score Without 3.7 1.8 3.5 3.8
  With 4.3 2.1 4.0 4.6
Conduct problem Score Without 2.9 1.4 2.8 3.0
  With 3.2 1.4 3.0 3.4
Peer problem score Without 4.9 1.5 4.8 5.1
  With 5.1 1.6 4.8 5.4
Total score Without 15.9 4.7 15.4 16.4
  With 17.3 4.6 16.5 18.1