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Table 1 Regression analysis for indicators of environmental risk predicting hyperactive-impulsive 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
Constant - 2.28 0.42 - 5.39 <0.001
Smoking in pregnancy 0.02 0.31 0.16 0.11 1.96 0.05
Social class 0.02 0.22 0.10 0.12 2.19 0.03
Birth weight <0.001 -0.00003 0.0001 -0.05 -0.85 0.40
CD symptoms 0.03 0.14 0.06 0.14 2.51 0.01
Age at assessment 0.01 -0.007 0.003 -0.12 -2.19 0.03
Verbal IQ 0.02 -0.003 0.002 -0.09 -1.71 0.04