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Worker Drug Use and Workplace Policies and Programs: Results from the 1994 and 1997 National Household Survey on Drug Abuse

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1 The workplace size measure used in this report is establishment size, rather than that of the firm as a whole since a firm can have many locations. Respondents were asked to indicate the size of the establishment at which they worked, based on their estimate of the number of employees at their particular location. Five response categories (less than 10, 10-24, 25-99, 100-499, and 500 or more employees) were collapsed into three (under 25, 25-499, and 500 and over). These three categories were found to preserve the principal observed differences without sacrificing any important information (SAMHSA, OAS, 1997).

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