Exercise: Congestive heart failure, answer 3

Question 3: How does a negative correlation between CHQ-C and HADS provide evidence for construct validity?

Suggested answer:

HADS measures anxiety and/or depression, high score = more anxious/depressed. We might anticipate that patients with poor quality of life would have an increased risk of psychological morbidity. Hence a negative correlation between CHF-C and HADS is what we would expect from a valid measure of quality of life.

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