Psychologists say a measure has construct validity when it, in fact, measures the construct it is intended to measure. Construct validity is both an important notion in psychological research methods ...

Background: Disease-specific Quality Of Life (QOL) measures are devised to assess the impact of a specific disease across a spectrum of important domains of life. The purpose of this study was to ...

Background: Problematic khat use, not khat use per se, is a public health and social concern for the public, researchers, and policy makers. However, the construct problematic khat use is not ...

Nutrient profiling models classify the healthiness of foods based on their nutritional composition and provide the science that underlies nutrition signposting schemes. The two objectives were to ...

Nutrient profiling classifies individual food products according to their nutrient content. According to the WHO (World Health Organization), validation is a key step in the development of a nutrient ...

The exponential growth of quality of life studies over the last three decades appears to be the cause of increased interest in rigorous evaluation of therapeutic interventions. General-health ...