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Background:  To investigate the phenomenon of internet addiction and concurrent social (off‐line) behaviours of an adolescent population a cross‐sectional survey of the entire adolescent student population (N = 1270, aged 14–18) of the island of Kos in Greece was conducted.

Method:  Completion by the survey participants of a demographic questionnaire, the 8‐question YDQ (Diagnostic Questionnaire for Internet Addiction) and the 20‐question IAT (Internet Addiction Test), followed by comparative analysis between and within usage groups.

Results:  Results demonstrate that 7.2% of male and 5.1% of female internet users present addictive behaviours while using the internet.

Conclusions:  Anti‐social, aggressive behaviours were significantly correlated with an increase to the pattern of abusive internet use in both sexes. Boys and girls had distinct profiles of off‐line and online preferences. Boys tended to …