“…The instrument was developed for epidemiological surveys, and can be used with children aged 6-18 years [Edelbrock and Costello, 1988b]. Good psychometric properties for the DISC have been reported in a number of studies [Bird et al, 1987;Costello et al, 1984Costello et al, , 1985Edelbrock et al, 1985;Edelbrock and Costello, 1988a;. A revised version of the instrument assessed more recently has also been shown to have good validity and reliability Schwab-Stone et al, 1993;Shaffer et al, 1993].…”