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Table 2 Association of onset age of nail biting by the psychiatric disorders

From: Association of nail biting and psychiatric disorders in children and their parents in a psychiatrically referred sample of children

Disorder

Mean age of onset

Significance*

With ADHD (n = 46)

6.2

U = 267.5, N1 = 46, N2 = 16, p = 0.1

Without ADHD(n = 16)

5.3

 

With ODD(n = 23)

5.2

U = 383.5, N1 = 39, N2 = 23, p = 0.3

Without ODD(n = 39)

6.4

 

With CD(n = 4)

4.7

U = 96.0, N1 = 58, N2 = 4, p = 0.5

Without CD(n = 58)

6

 

With Tic(n = 8)

6.4

U = 188.5, N1 = 8, N2 = 54, p = 0.5

Without Tic(n = 45)

5.9

 

With MDD(n = 4)

11.4

U = 188.5, N1 = 4, N2 = 54, p = 0.5

Without MDD(n = 58)

5.6

 

With SAD(n = 12)

5.5

U = 53.5, N1 = 12, N2 = 50, p = 0.07

Without SAD(n = 50)

6.0

 

With Enuresis(n = 10)

4.9

U = 222.0, N1 = 10, N2 = 52, p = 0.4

Without Enuresis(n = 52)

6.1

 

With OCD(n = 7)

6.7

U = 158.0, N1 = 7, N2 = 55, p = 0.4

Without OCD(n = 55)

5.8

 

With PDD(n = 2)

7.0

U = 44.0, N1 = 2, N2 = 60, p = 0.5

Without PDD(n = 60)

5.9

 

With MR(n = 6)

5.5

U = 124.0, N1 = 6, N2 = 56, p = 0.3

Without MR(n = 56)

6.0

 
  1. ADHD = Attention deficit hyperactivity disorder, ODD = Oppositional defiant disorder, CD = Conduct disorder, MDD = Major depressive disorder, SAD = Separation anxiety disorder, MR = Mental retardation, OCD = Obsessive compulsive disorder, PDD = Pervasive developmental disorder
  2. * Mann-Whitney U test.
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Child and Adolescent Psychiatry and Mental Health

ISSN: 1753-2000