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Gould LC, Berberian RM, Kasl SV. 
“Sequential Patterns of Multiple-Drug Use Among High School Students”. 
Arch Gen Psychiat. 1977;34:216-222.
Abstract
Only recently have multiple-drug use studies involving more than heroin and marijuana begun to be reported in the literature. Four of these studies have found evidence that mulilple-drug use is a progressive phenomenon, although the particular pattern of multiple-drug use reported In ditterent populations varies somewhat. This study examines the patterns of multiple-drug use reported by a random sample of 1,094 high school students living in greater New Haven, Conn In the 1972-1973 academic school year. scalogram analysis reveals a progressive relationship for nine drugs: alcohol, marijuana, hashish, barbiturates, amphetamines, LSD, mescaline, cocaine, and heroin. Clgarettes and glue were not found to play a part in this pattern. The temporal order in which respondents reported that they had begun using each drug supports the results of scalogram analysis only in part.