COMPARISON OF 3 DATA-COLLECTION METHODOLOGIES FOR THE STUDY OF YOUNG ILLICIT DRUG-USERS

Three data collection methods (street-intercept, telephone ring-in and focus-group discussions) were compared for, their feasibility, reliab ility, validity and cost. The subjects of investigation were drug-rela ted behaviours, attitudes, and knowledge among current illicit drug us ers aged 16 to 21 years in Sydney. All three methods were found to be feasible and to produce reliable and valid information. Few difference s in the demographic make-up and drug-use profiles of the samples were evident. The main differences between the data collections related to cost and the type of information obtained. The street-intercept metho d was the cheapest per completed interview and the focus-group method was the most expensive. Focus-group discussions were considered a valu able adjunct to the surveys because they facilitated an understanding of the quantitative survey results. It was concluded that the street-i ntercept method is the preferred survey method because of its lower co st and lower susceptibility to volunteer bias compared to the telephon e ring-in. For repeated data collection to monitor changes in drug use patterns, street-intercept surveys in combination with focus-group di scussions are recommended.