criminal behaviour.

Researchers say the findings have major implications for Government policy makers charged with tackling the problem, which has longer-term and costly health implications for the nation.

The research team, which estimates there are least one million binge drinkers in the 18-24 year old population participating in 1.5 million binge drinking events each week, used complex modelling techniques and interviews with 504 18-24 year olds to draw their conclusions.

Binge drinkers were defined as participants who got drunk on three or more drinks (women) or on four or more drinks (men) at least once a week, or having ten or more drinks but not necessarily getting drunk at least once a week (both men and women). Using this criteria, nearly one-fifth (16.2 per cent) of the young people surveyed were classed as binge drinkers.

Everyone in the survey was asked whether about the drinking behaviour of their friends, family and colleagues. Binge drinkers were more likely to describe their associates, particularly their friends, as fellow binge drinkers.

The second part of the research set out to test whether imitation behaviour' or copying was sufficient to account for the binge drinking through applying a series of models.

It found that the small world' model, showing the interaction between overlapping friendship groups, best explained the statistics for the first part of the research. This suggests complex social networking and the behaviour exhibited through this is the root cause of binge drinking.

Researchers say these findings pose challenges for policy makers in terms of identifying where and at whom to target their policies - they would need to tap into a series of complex friendship networks for their efforts to have any effect. However, if they could achieve this, triggering a reverse in binge drinking behaviour, the effect would be quite dramatic.

The research is published online via an open access website http://arxiv.org/.

Lead author, Paul Ormerod, of Durham University's Institute of Advanced Study and Volterra Consulting UK, said: "This discovery is helpful to policy makers as it suggests, for example, that strategies based on the concept that there is a small number of influentials' who are important in the spread of anti-social behaviour are not likely to be very successful."

The paper Binge drinking in the UK: A social network phenomenon' by Paul Ormerod and Greg Wiltshire can be accessed here: http://arxiv.org/ftp/arxiv/papers/0806/0806.3176.pdf

Article published on 19/06/2008

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