Further, the APQ is reliable, simple to administer and is likely to be useful in the assessment and study of problem drinkers in the clinical and research settings. These findings add further weight to the view that alcohol-related problems represent a phenomenon which is conceptually, as well as statistically, distinct from dependence. However, a test cannot be valid if it is not reliable. Test results do not have to be valid to be reliable. The APQ was found to be highly reliable and the previous finding that dependence is a mediating factor in the relationship between consumption and problems was replicated. The relationship between reliability and validity can be expressed in various forms. Criterion-related validity attempts to evaluate the presence of a relationship between the standard measure and another measure. In this chapter we will differentiate between the two as well as introduce concepts such as agreement. Dependence and consumption scores were obtained along with socio-demographic information in order to study the construct validity of the APQ. Reliability and validity are both important in kinesiology and they are often confused. In the present study 101 subjects participated in a test-retest reliability study. The reliability of the APQ was, however, unknown. It has been used to study the relationship between alcohol-related problems and dependence within the bi-axial model. The Alcohol Problems Questionnaire (APQ) was designed as a clinical instrument for measuring alcohol-related problems.
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