Exercise: Congestive heart failure, answer 4

Question 4: ‘Known-groups comparison also demonstrated the ability of CHQ-C to differentiate the QOL of people with or without CHF.’ What type of validity does this show?

Suggested answer:

This is the ability to discriminate between different groups, often called ‘discriminant validity’. It is also evidence for construct validity, as we might expect people with CHF to have poorer quality of life than those without CHF. It is not evidence for criterion validity, because the CHQ-C measures quality of life, not degree of heart disease.

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