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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.