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Table 4 Linear Regression analysis for indicators of environmental risk predicting Oppositional defiant symptoms:

From: Effects of low birth weight, maternal smoking in pregnancy and social class on the phenotypic manifestation of Attention Deficit Hyperactivity Disorder and associated antisocial behaviour: investigation in a clinical sample

  R2 Unstandardised Standardised   
   Beta Standard error Beta t p-value
Smoking in pregnancy 0.01 0.58 0.26 0.12 2.20 0.03
Social class 0.004 0.19 0.17 0.06 1.14 0.26
Birth weight <0.001 0.0003 0.0001 -0.08 -1.37 0.71