Table 1 Differences between the risk profiles in age of onset, externalising type of behaviour and demographic characteristics (N = 225)
|  | Overall mean or percentage | Three-domain risk profile (n = 95) | Four-domain risk profile (n = 57) | Profile with mainly peer risks (n = 41) | Profile with mainly family risks (n = 32) | F/χ2 | p |
|---|---|---|---|---|---|---|---|
Age at admission in years | 16.8 | 17.1 | 17.3 | 16.1 | 15.8 | 7.29 | 0.000 |
Early onset | 56% | 46% | 60% | 56% | 81% | 12.56 | 0.006 |
Aggressive behaviour | 13.0 | 12.6 | 12.5 | 11.8 | 16.2 | 2.42 | 0.067 |
Rule-breaking behaviour | 10.4 | 11.8 | 10.4 | 7.9 | 9.7 | 5.51 | 0.001 |
Previous delinquent behavioura | Â | Â | Â | Â | Â | Â | Â |
 No conviction | 28.4% | 20.0% | 15.8% | 46.3% | 53.1% | 22.83 | 0.000 |
 Drug offence | 6.2% | 11.6% | 1.8% | 2.4% | 3.1% | 6.67 | 0.061 |
 Vandalism (property) | 27.1% | 35.8% | 36.8% | 9.8% | 6.3% | 21.27 | 0.000 |
 Property offence without violence | 42.2% | 51.6% | 64.9% | 7.3% | 18.8% | 46.93 | 0.000 |
 Moderate violent offence | 48.9% | 54.7% | 66.7% | 29.3% | 25.0% | 22.29 | 0.000 |
Violent property offence | 24.0% | 34.7% | 29.8% | 7.3% | 3.1% | 23.25 | 0.000 |
 Serious violent offence | 7.1% | 11.6% | 8.8% | 0% | 0% | 8.69 | 0.023 |
 Sex offence | 8.9% | 4.2% | 8.8% | 22.0% | 6.3% | 9.70 | 0.015 |
 Manslaughter | 3.6% | 1.1% | 7.0% | 4.9% | 3.1% | 4.21 | 0.182 |
 Arson | 0% | 0% | 0% | 0% | 0% | – | – |
 Murder | 1.8% | 1.1% | 3.5% | 2.4% | 0% | 1.90 | 0.609 |
Axis-I classification of DSM-IV-TRb,c | Â | Â | Â | Â | Â | Â | Â |
 Disruptive behaviour disorder | 45.3% | 53.7% | 56.1% | 24.4% | 28.1% | 16.59 | 0.001 |
 Autism spectrum disorder | 37.8% | 38.9% | 21.1% | 70.7% | 21.9% | 28.73 | 0.000 |
 Substance disorder | 25.8% | 37.9% | 35.1% | 0% | 6.3% | 37.31 | 0.000 |
 Attention deficit/hyperactivity disorder | 24.9% | 32.6% | 15.8% | 22.0% | 21.9% | 5.72 | 0.122 |
 Reactive attachment disorder | 15.1% | 4.2% | 26.3% | 9.8% | 34.4% | 24.37 | 0.000 |
 Anxiety disorder | 8.4% | 3.2% | 12.3% | 4.9% | 21.9% | 11.44 | 0.006 |
 Schizophrenia or other psychotic disorder | 6.2% | 8.4% | 10.5% | 0% | 0% | 7.23 | 0.048 |
 Mood disorder | 6.2% | 6.3% | 5.3% | 9.8% | 3.1% | 1.38 | 0.723 |
 Other disorder usually first diagnosed in infancy, childhood or adolescence | 5.3% | 5.3% | 0% | 7.3% | 12.5% | 7.22 | 0.041 |
 Axis-II classification of DSM-IV-TRb |  |  |  |  |  |  |  |
 Personality disorder | 4.9% | 2.1% | 12.3% | 0% | 6.3% | 8.73 | 0.016 |
 Mental retardation | 8.9% | 10.5% | 14.0% | 4.9% | 0% | 6.14 | 0.098 |