BMJ 2001;323:191-194 ( 28 July )

Papers

Financial cost of social exclusion: follow up study of antisocial children into adulthood

Stephen Scott, senior lecturer a, Martin Knapp, professor b, Juliet Henderson, researcher a, Barbara Maughan, MRC external scientific staff c. 

a Department of Child and Adolescent Psychiatry, Institute of Psychiatry, King's College London, London SE5 8AF, b Centre for the Economics of Mental Health, Institute of Psychiatry, c MRC Social, Genetic and Developmental Psychiatry Research Centre, Institute of Psychiatry

Correspondence to: S Scott s.scott{at}iop.kcl.ac.uk


    Abstract
Top
Abstract
Introduction
Participants and methods
Results
Discussion
References

Objectives: To compare the cumulative costs of public services used through to adulthood by individuals with three levels of antisocial behaviour in childhood.
Design: Costs applied to data of 10 year old children from the inner London longitudinal study selectively followed up to adulthood.
Setting: Inner London borough.
Participants: 142 individuals divided into three groups in childhood: no problems, conduct problems, and conduct disorder.
Main outcome measures: Costs in 1998 prices for public services (excluding private, voluntary agency, indirect, and personal costs) used over and above basic universal provision.
Results: By age 28, costs for individuals with conduct disorder were 10.0 times higher than for those with no problems (95% confidence interval of bootstrap ratio 3.6 to 20.9) and 3.5 (1.7 to 6.2) times higher than for those with conduct problems. Mean individual total costs were £70 019 for the conduct disorder group (bootstrap mean difference from no problem group £62 898; £22 692 to £117 896) and £24 324 (£16 707; £6594 to £28 149) for the conduct problem group, compared with £7423 for the no problem group. In all groups crime incurred the greatest cost, followed by extra educational provision, foster and residential care, and state benefits; health costs were smaller. Parental social class had a relatively small effect on antisocial behaviour, and although substantial independent contributions came from being male, having a low reading age, and attending more than two primary schools, conduct disorder still predicted the greatest cost.
Conclusions: Antisocial behaviour in childhood is a major predictor of how much an individual will cost society. The cost is high and falls on many agencies, yet few agencies contribute to prevention, which could be cost effective.


What is already known on this topic
Children who show substantial antisocial behaviour have poor social functioning as adults and are at high risk of social exclusion

Costs are available for particular items of public service such as receiving remedial education or appearing in court

What this study adds
Costs of antisocial behaviour incurred by individuals from childhood to adulthood were 10 times greater for those who were seriously antisocial in childhood than for those who were not

The costs fell on a wide range of agencies

Reduction of antisocial behaviour in childhood could result in large cost savings



    Introduction
Top
Abstract
Introduction
Participants and methods
Results
Discussion
References

The term "conduct disorder" refers to a persistent and pervasive pattern of antisocial behaviour in childhood or adolescence.1 Typical behaviours include disobedience, tantrums, fighting, destructiveness, lying, and stealing. Conduct disorder is the commonest psychiatric disorder in childhood, with a prevalence of 7% in boys and 3% in girls2; it is also the commonest reason for referral of children and adolescents to mental health services.3

Conduct disorder is strongly associated with social and educational disadvantage. It occurs four times more often in families with unskilled occupations than in professional families2; reading difficulties are common, and many children leave school without qualifications or are permanently excluded. 4 5 The antisocial behaviour tends to persist---40% of 8 year olds with conduct disorder are repeatedly convicted of crimes such as theft, vandalism, and assault in adolescence.6 The misuse of drugs and alcohol is widespread. In adulthood these individuals continue offending and have erratic employment patterns in unskilled jobs, violent relationships with partners, and few friends.5 They do not participate in mainstream society and remain socially excluded.

Few direct studies have looked at the economic costs of conduct disorder or its consequences.7 Related studies suggest that costs are high. In the United States the cost for crimes committed by a typical juvenile delinquent (under 18) was estimated at $80 000-$325 000 (£56 000-£232 000).8 Between ages 19-24 a typical adult criminal costs a further $1.2m. Victim costs were by the far the greatest part of this total. Rescuing a high risk youth from this typical life path was estimated to save $1.7m-2.3m.8

In the United Kingdom, identifying young offenders costs the police £1200 and successful prosecution a further £2500. A week in a local authority secure unit costs £3450.9 Our own pilot study, of children aged 4-8 referred with conduct disorder, found that the mean extra cost was £15 282 a year (range £5411-£40 896). Of this, 31% was borne by families, 31% by education services, 16% by the NHS, 15% by state benefit agencies, 6% by social services, and less than 1% by the voluntary sector.10

In the United Kingdom there has been growing recognition of the costs of antisocial behaviour and social exclusion originating in childhood. Unless there are adequate specialised services for the mental health needs of children, the economic and social costs will be considerable later on. 11 12 The Audit Commission has called for better information on resources spent on children's mental health and has recommended that agencies commission children's services jointly.3 We aimed to determine the costs to the public sector incurred to age 28 in dealing with children with different levels of antisocial behaviour and to examine childhood predictors of long term cost.


    Participants and methods
Top
Abstract
Introduction
Participants and methods
Results
Discussion
References

Inner London longitudinal study
We applied costs to data from the inner London longitudinal study, an epidemiological study of psychiatric problems and attainment in people from a disadvantaged inner London borough.13 The study began in 1970 when the children were 10 and tracked their progress to their late 20s. All 10 year olds (n=2281) attending state primary schools in the borough were screened using the Rutter teacher questionnaire.14 Two subsamples were selected for intensive study: a random 1 in 12 sample of the total population and a 1 in 2 sample of children who had screened positive for emotional and behavioural problems. Children were tested individually with the Neale reading test.15

The participants were divided into three subgroups: no behavioural or emotional problems on screening or parental interview; high scores on screening, with a predominance of antisocial problems but no disorder on parental interview; and high scores on screening, with a diagnosis of conduct disorder on parental interview. At follow up in 1986-8 data were available on 65 of 80 (81%), 61 of 73 (84%), and 16 of 22 (73%) participants, respectively. The participants' mean age was 27.7 (SD 1.27) years.

Investigator based follow up interviews included measures of housing; educational history; psychosocial functioning as an adult, including work and marital history16; psychiatric history as an adult and service contacts17; and alcohol problems.18 Estimation of service use was based on these retrospective accounts.19 Official criminal records were searched.

Costing methods
We calculated costs for each individual across six domains: foster and residential care in childhood, special educational provision, state benefits received in adulthood, breakdown of relationship (domestic violence and divorce), health, and crime. We allocated costs for every service reported as used above the basic provision prevailing at the time, whether or not utilisation seemed to arise from antisocial behaviour. For example, extra remedial teaching was costed but basic schooling was not. Further examples of services used and costs applied are given in the full version on the BMJ s website. We applied 1998 price levels for services. We took unit costs from national sources for health and social care services, criminal justice, and benefit receipts.20-22 We calculated other costs from first principles using agencies' data, ensuring that their coverage (for example, of travel, supervision, and overheads) was consistent with the national sources.

No costs were allocated for use of social services, voluntary organisations, primary health care, lost employment, divorce (other than public legal costs), undetected crime,5 the costs to victims of crime, 8 22 parents' or partners' use of services arising from the participant's behaviour, indirect costs to families, or psychological impact. For some events the dataset did not include frequency, so only one episode was costed. Abortion and domestic violence were only costed for index female participants, not partners of male participants.

Analysis strategy
As the data for costs were highly skewed, we used bootstrap estimation to derive 95% confidence intervals of differences and ratios between groups. We used bootstrap multiple regression to determine childhood predictors of total cost.23


    Results
Top
Abstract
Introduction
Participants and methods
Results
Discussion
References

Costs of each domain---Table 1 shows the mean individual costs for each domain; the total individual cost ranged from £0 to £379 292. Crime was the costliest domain in all the groups and constituted almost two thirds of the total cost in the conduct disorder group.


                              
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Table 1. Arithmetic mean of total costs of services (in £ at 1998 prices) used by individuals to age 28 according to group at age 10 

Cost differences between groups---The conduct disorder group cost 10 times more than the no problems group and the conduct problem group over three times more (table 2).


                              
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Table 2. Mean differences and ratios between total individual costs (in £ at 1998 prices) by age 28 according to group membership at age 10 

Personal characteristics and educational attainment in childhood in relation to cost---Other childhood characteristics were also associated with variations in cost. Being male led to higher costs. Being from a family of lower socioeconomic status, having a low reading age, and attending more than two primary schools led to significantly higher costs with t tests but just missed significance with bootstrap tests.

Childhood predictors of total cost---After allowance for personal characteristics and educational variables in childhood, multiple regression analysis showed that conduct disorder predicted most cost (table 3). Conduct problems, sex, reading age, and number of primary schools attended made substantial independent contributions and parental socioeconomic status a smaller contribution.


                              
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Table 3. Factors at age 10 predicting total cost (in £ at 1998 prices) by age 28, determined by multiple linear regression analysis




    Discussion
Top
Abstract
Introduction
Participants and methods
Results
Discussion
References

Antisocial behaviour at age 10 was a powerful predictor of the total cost of public services used by age 28. This remained true after allowance for being male, a poor reader, and being raised in a family of lower socioeconomic status. Total costs increased steeply with increasing antisocial behaviour: individuals with conduct problems as rated by a teacher cost over three times as much and individuals with conduct disorder cost 10 times as much as those without.

Limitations
Several aspects of service usage were not costed, and indirect costs were not assessed. Including these might have increased the total cost several-fold and be a better reflection of the "true" cost. Therefore the ratio of costs between groups and domains is an important measure.

The borough studied was relatively socially deprived, with high levels of antisocial behaviour13; however, rates of antisocial behaviour in youths in the United Kingdom have since risen to comparable levels.5

Implications
Antisocial behaviour in childhood often leads to lifelong social exclusion.5 It imposes considerable costs in childhood10 and high public expenditure and personal distress by adulthood. The impact on public spending is substantial. In our sample 3% of the population was classified with conduct disorder and a further 9% with conduct problems, values that are typical for the United Kingdom and United States.5 This 12% of the population accounted for around half of the public expenditure assessed.

There are effective interventions for antisocial behaviour in children, but they are seldom routinely available. Parent training programmes have been shown to have large effects in the United States,24 and our own study showed they can be equally effective in the United Kingdom.25 Typical programmes cost £600 per child and are likely to save money in the longer term. 25 26 Complementing a family based approach, there are effective behaviour management and social skills programmes for primary schools.27 In contrast, interventions for serious antisocial behaviour in teenagers are much less effective.5 Therefore there is a case for implementing effective early interventions with families and with children at school.

The current UK government has launched several initiatives to reduce antisocial behaviour and social exclusion in high risk areas. The "surestart" programme targets children aged 0-3 years with "one stop shop" services for their parents. The "on-track" programme aims to prevent antisocial behaviour in 4-12 year olds and avoid crime later on. The "health action zones" have goals such as reducing exclusions in school, drug misuse, and early pregnancy. They are, however, confined to specific areas, often do not use proved interventions, and are short term.

Organisational barriers prevent effective service organisation. Many agencies are simply not aware that antisocial behaviour in childhood leads to high costs for them. Among agencies working with children (health, education, social services, and voluntary agencies) none is primarily responsible for antisocial behaviour, and few consistently use evidence based interventions. Health commissioners have little direct financial incentive to prioritise effective intervention because their service bears little of the long term cost. Mental health services for children in the United Kingdom lack the resources to oversee widespread implementation of effective interventions; spending was £9 per child in 1997-8.3 A well coordinated multiagency approach that used interventions of proved effectiveness could considerably reduce the costs of antisocial children when they are grown up.

    Acknowledgments

We thank Jack Astin for statistical analysis. MK is also professor at the London School of Economics Health and Social Care, London School of Economics. JH is also researcher at the Centre for the Economics of Mental Health, Institute of Psychiatry.

    Footnotes

Funding: Mental Health Foundation; SS held a Wellcome training fellowship for part of the project.

Competing interests: None declared.

The full version of this article appears on the BMJ's website


    References
Top
Abstract
Introduction
Participants and methods
Results
Discussion
References

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23. Thompson SG, Barber JA. How should cost data in pragmatic randomised trials be analysed? BMJ 2000; 320: 1197-1200[Full Text].
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27. Durlak JA. School-based prevention programmes for children and adolescents. London: Sage, 1997.

(Accepted 25 April 2001)

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